how to prove a quadrilateral is a rectangle class 9

Similarly, \angle B = \angle D. Find all the angles of the quadrilateral. Similarly, we can show that \angle C = {90^ \circ } and \angle D = {90^ \circ } Hence, quadrilateral ABCD is a parallelogram. \frac{1}{2}\angle A + \frac{1}{2}\angle B = {90^ \circ } But, \angle BOC + \angle DOC = {180^ \circ } And, \angle BAC = \angle DCA To prove a quadrilateral is a rectangle: 1) Prove the shape is a parallelogram by doing slope 4 times by stating that parallel lines have equal slopes. Print; Share; Edit; Delete; Host a game. ABCD is a parallelogram such that one of its angles, say , \angle A is a right angle. Thus, the sum of four angles of a quadrilateral is 360º. Contact. Since ABCD is a parallelogram. Proof: Now, in \Delta s ABC and CDA, we have Given: A parallelogram ABCD It is given that and transversal intersects them at points and respectively. AB\parallel DC and AD\parallel BC \Delta AOB \cong \Delta COD 12, Dec 20. Edit. So, by SAS criterion of congruence, we have 1800-212-7858 / 9372462318. Play. You can prove that the diagonals are of equal length by using the distance formula on points A & C and B & … OB = OD and OA = OC    …..(ii) \angle A + \angle B + \angle C + \angle D = {360^ \circ }   ……(iv) Prove that a quadrilateral is a rectangle. To prove: \angle A = \angle B = \angle C = \angle D = {90^ \circ }Proof: Since ABCD is a rectangle. 3. Proving a Quadrilateral is a Parallelogram DRAFT. BO = OD \angle AOD = \angle COBSo, by SAS criterion of congruence, we have Prove that ABCD is a rectangle. Tamilnadu Samacheer Kalvi 9th Maths Solutions Chapter 4 Geometry Ex 4.2 Practice. Adjacent sides of a rectangle are in the ratio 5 : 12. AD\parallel BC \angle B = {90^ \circ } Hence, AC bisects \angle C. \angle AED = \angle CEF AD\parallel BC Contact us on below numbers. Get RD Sharma Solutions for Class 9 Chapter Quadrilaterals here. A quadrilateral is a shape which has four sides. \Delta AED \cong \Delta CFE AD = DB Ex 10.5, 7 If diagonals of a cyclic quadrilateral are diameters of the circle through the vertices of the quadrilateral, prove that it is a rectangle. Academic Partner. Proof: \Delta ABC \cong \Delta CDA, (3) Prove that two opposite angles of a parallelogram are equal. Education Franchise × Contact Us. Similarly, \angle AOB = \angle AOD = {90^ \circ } (7) Prove that the angles bisectors of a parallelogram form a rectangle. Join DE prime.Now, in \Delta ABC, D is the mid-point of AB and E prime is the mid-point of AC. From (iii) and (iv), we have Given: A parallelogram ABCD in which AC \bot BD. Similarly, AB\parallel CD Since the diagonals of a parallelogram bisect each other. (i)   [AS and BS are bisectors of \angle A and \angle B respectively] Now, (Alternate angles as and p is a transversal). Thus, line AC intersects AB and DC at A and C respectively such that \angle A = \angle C. Hence, PQRS is a parallelogram. BC = AB      [Angles opposite to equal sides are equal] (2) Prove that a diagonal of a parallelogram divides it into two congruent triangles. 4. \angle 1 = \angle 2         ……..(iii) CBSE CLASS 9 MATHEMATICS / MCQ Multiple Choice Questions on QUADRILATERALS – Chapter 8. - The diagonals bisect each other. Thus, ABCD is rhombus as it is a parallelogram whose diagonals intersect at right angle. Hence, parallelogram ABCD is a rhombus. Want to learn by Video Lectures? {90^ \circ } + \angle APB = {180^ \circ }          [From (i)] Now, DF intersects AD and FC at D and F respectively such that PQ\parallel AC and PQ = \frac{1}{2}AC   …. Here we have given Karnataka Board Class 9 … We have, Practice. \angle A + \angle B = {180^ \circ }  [Sum of consecutive interior angles is {180^ \circ }] \angle RSP = {90^ \circ } [\angle ASB and \angle RSP are vertically opposite angles \angle RSP = \angle ASB] AD\parallel BC    ……(vi) 2. AD\parallel BC and AB\parallel DC. document.write(''); BC = CB There are three ways to prove that a quadrilateral is a rectangle. According to NCERT Solutions for Class 9 Maths Chapter 8 quadrilateral is a plane figure that has four sides or edges, and also has four corners or vertices. MCQ Questions for Class 9 Maths Chapter 8 Quadrilaterals with Answers MCQs from Class 9 Maths Chapter 8 – Quadrilaterals are provided here to help students prepare for their upcoming Maths exam. AB = BC = CD = DA Hence, ABCD is a parallelogram. \angle OAD = \angle OCB Thus, in quadrilateral PQRS one pair of opposite sides are equal and parallel. Now, AD\parallel BC and AB intersects them at A and B respectively. To prove: ABCD is a parallelogram.Proof: In quadrilateral ABCD, we have This quiz is incomplete! \angle BOC = \angle DOC (9) Prove that a quadrilateral is a parallelogram if its opposite angles are equal. In \Delta ADC, R and S are the mid-points of CD and AD respectively. Now, AB\parallel DC and transversal AC intersects them at A and C respectively. \left( {\angle A + \angle B} \right) + \left( {\angle A + \angle B} \right) = {\text{ }}360^\circ The adjoining figure is a rectangle whose diagonals AC and BD intersect at O. i = "0" + i; On this page, you will find Quadrilaterals Class 9 Notes Maths Chapter 9 Pdf free download. \angle B = \angle D   ……(ii) The bisectors of and intersect at and bisectors of and intersect at. Square C. Trapezium. If you have any doubts, please comment below. Watch Queue Queue. To prove: AC bisects \angle CProof: Since ABCD is a parallelogram. DBCF is a parallelogram. \angle A + \angle C + \angle D + \angle B = {360^ \circ } Cyclic Quadrilateral. Chapter 14 Quadrilaterals R.D. Delete Quiz. AC = AC From (i) and (ii), we obtain that ABCD is a parallelogram whose all side are equal and all angles are right angles. ABCD is a parallelogram Please help, and explain how you did it :] Hence, AC = BD. Given: A rectangle ABCD such that \angle A = {90^ \circ } If you have any query regarding NCERT Solutions for Class 9 Maths Chapter 8 Quadrilaterals Ex 8.1, drop a comment below and we will get back to you at the earliest. Download NCERT Books, Video Lectures ASK DOUBTS Start Discusssion Free JEE Test Series, Get the most advanced study material and top your exams. A parallelogram with two right angles must be a square. Let E prime be the mid-point AC. \Delta ABD \cong \Delta BAC Now, AB\parallel DC and transversal AD intersects them at A and D respectively. So a quadrilateral is any shape that has 4 sides Example: square. If the diagonals of a quadrilateral bisect each other at right angles, then it is a. Proof of Mid-Point Theorem. ... 100, 120, 60. In a rectangle, the interior angles measure 90 each. \angle A + \angle D = {180^ \circ }  ……. 2. but option 3 is false. From (i) and (ii), we find that two intersecting lines DE and DE’ are both parallel to Line BC. Now, line BC intersects AB and DC at A and C respectively such that Given: A parallelogram ABCD in which diagonal AC bisects \angle A. (6) Prove that if a diagonal of a parallelogram bisects one of the angles of the parallelogram it also bisects the second angle. Sharma Solutions for Class 9th MCQ's Get the complete notes on quadrilaterals class 9 here. To prove: \angle APB = {90^ \circ }Proof: Since ABCD is a parallelogram. i.e., the sum of consecutive interior angles is {180^ \circ }. Share practice link. AB = BC = CD = DA (16) Prove that the diagonals of a rhombus are perpendicular to each other. function checkTime(i) { \angle CAB = \angle ACD      .....(ii) return i; First, we know that rectangles are parallelograms, so... - The opposite sides are parallel and congruent. 9th - 12th grade . To prove: OA = OC and OB = ODProof: Since ABCD is a parallelogram. Given: A parallelogram ABCD such that the bisectors of consecutive angles A and B intersect at P. since the sum of the angles of a quadrilateral is 360, A quadrilateral has _____ sides and _____ angles. Watch Queue Queue Show that the quadrilateral formed by the bisectors of interior angles is a rectangle. Every quadrilateral has : (i) Four vertices, (ii) Four sides, (iii) Four angles and (iv) Two diagonals. So, by SAS criterion of congruence, we have var month = ("0" + (now.getMonth() + 1)).slice(-2); AD = BC AO \bot BD Therefore, To prove: PQRS is a parallelogram.Proof: In \Delta ABC, P and Q are the mid-points of sides AB and BC respectively. (17) Prove that diagonals of a parallelogram are perpendicular if and only if it is a rhombus. Contact us on below numbers. To play this quiz, please finish editing it. Learn Insta try to provide online math tutoring for you. In \Delta APB, we have Now, AD\parallel BC and transversal AB intersects them. The angles of quadrilateral are in the ratio 3 : 5 : 9 : 13. Now, line AC intersects AD and BC at A and C respectively such that \frac{1}{2}\angle A + \frac{1}{2}\angle B = {90^\circ } OD = OD Construction: Join AC.Proof: In \Delta s ABC and CDA, we have \angle A + \angle B = {180^ \circ } AB = CD = AD = BC Now, AD\parallel BC and line AB intersects them at A and B. Several students in a class made the following statements. Question 9. Prepare for your exams with the help of these important questions to score good marks. } 23, Oct 20. (20) Prove that the line segment joining the mid-points of any two sides of a triangle is parallel to the third side and equal to half of it. \angle A + \angle B = {180^ \circ } AD\parallel BCNow, AD\parallel BC and transversal AB intersects them at A and B respectively. This document is highly rated by Class 9 … Therefore, Similarly, we can prove that b. Given: A quadrilateral ABCD in which AB = CD and AB\parallel CD. AB\parallel DC and AD\parallel BC This is contradiction to the parallel line axiom. Maths Class 9 Notes for Quadrilaterals A quadrilateral is a closed figure obtained by joining four point (with no three points collinear) in an order. document.write(''); \angle 1 + \angle 2 = {90^ \circ } …. Proof: In \Delta s ABC and DCB, we have But, in \Delta ABS, we have Solo Practice. AD = CD    ……(ii) or own an. \angle ABD = \angle CDB OA = OC, OB = OD and ∠AOB = ∠BOC = ∠OCD = ∠ODA = 90°, ∠AOB = ∠COB (Opposite sides of a parallelogram are equal). To prove: AB = BC = CD = DA.Proof: Since ABCD is rhombus (i) If you disagree, change the statement to make it correct. 90 B. \angle A + \angle D = \angle D + \angle C ML Aggarwal Class 9 Solutions for ICSE Maths Chapter 14 Theorems on Area Chapter Test Question 1. To prove a quadrilateral is a rectangle: 1) Prove the shape is a parallelogram by doing slope 4 times by stating that parallel lines have equal slopes. In this article, we are going to discuss the different types of quadrilaterals such as square, rectangle, parallelogram properties with proofs. Here we have given NCERT Class 9 Maths Notes Chapter 9 Quadrilaterals. Sol. For Study plan details. To prove: \Delta ABCD is a parallelogram. In the figure, O is the centre of the circle and . prove that the angle bisectors of a parallelogram form a rectangle - Mathematics - TopperLearning.com | ey0y1ajee. OB = OD \angle 1 = \angle 3   ……(i) [Alternate interior angles] Again, AB\parallel DC and BD intersects them at B and D respectively. if (i < 10) { If ∠OAB = 27°, then find ∠OBC. Prove that the quadrilateral obtained by joining the mid-points of an isosceles trapezium is a rhombus. \angle CAB = \angle ACD        …. Mid-point Formula in Coordinate Geometry. Finish Editing. Solution. var h = now.getHours(); the sum of consecutive interior angles is {180^ \circ } NCERT Class 9 Maths Quadrilaterals . Save. \angle C + \angle B = {180^ \circ } //var today = now.getFullYear()+"-"+(month)+"-"+(day); \Delta AOD \cong \Delta COB Quadrilateral ABCD has vertices A(6,0), B(3,9), C(-3,7), and D(0,-2). The fourth angle is, Given, three angles of a quadrilateral are 75, 90 and 75, Now, sum of all angles of a quadrilateral = 360, If ABCD is a Parallelogram with 2 Adjacent angles ∠A=∠B, then the parallelogram is a, Given ABCD is a Parallelogram with 2 Adjacent angles ∠A = ∠B, Since the sum of adjacent angles of a parallelogram is 180, Since the measure of each angle of the parallelogram is 90. \angle APB = {90^ \circ }. From (i) and (ii), we have In a cyclic quadrilateral, the sum of opposite angles is 180 degree. Complete the following definition. Thus, \angle ABC = \angle DCB = {90^ \circ }. \Delta AOD \cong \Delta COD Again, AD\parallel BC and AC intersects them. Edit. From (vi) and (vii), we get Quadrilaterals will typically be of standard shapes with four sides like rectangle, square, trapezoid, and kite or irregular and uncharacterized shapes. Hence, ABCD is a rectangle. Hence, \angle AOB = \angle BOC = \angle COD = \angle DOA = {90^ \circ }. \angle A + \angle B = \angle C + \angle D  …..(iii) The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Need assistance? Hence, all the four sides of a rhombus are equal. Now, in \Delta s BOC and DOC, we have Therefore, DB\parallel CF    …..(iv) We want to determine whether a quadrilateral whose vertices in [math]3D[/math] are known is a rectangle. Hence, PQRS is a rectangle. MCQs from CBSE Class 9 Maths Chapter 8: Quadrilaterals 1) The quadrilateral whose all its sides are equal and angles are equal to […] Given: A rectangle ABCD with AC and BD as its diagonals. Hence, ABCD is a parallelogram. Therefore, Ask Question CBSE - Class 9 Maths Quadrilaterals. Similarly, line AC intersects BC and AD at C and A such that, Since sum of the angles of a quadrilateral is, Now, line AB intersects AD and BC at A and B respectively such that, i.e. Maths Class 9 Notes for Quadrilaterals A quadrilateral is a closed figure obtained by joining four point (with no three points collinear) in an order. alternate interior angles are equal. Decide whether you agree with each statement. 8 months ago. To prove: \angle BOC = \angle DOC = \angle AOD = \angle AOB = {90^ \circ }4Proof: We know that a parallelogram is a rhombus, if ll of its sides are equal. All types of questions that can come in the EXAM are given here..!! Let ABCD be a quadrilateral whose diagonals bisect each other at right angles. {90^ \circ } + \angle B = {180^ \circ } To Prove: A diagonal, say, AC, of parallelogram ABCD divides it into congruent triangles ABC and CDA i.e. Quadrilateral: A plane figure bounded by four lines segment AB, BC, CD and DA is called a quadrilateral. AB = AD (i) \angle 1 + \angle 4 + \angle 6 = {180^ \circ }..........(i) \angle BAO = \angle DCO ……..(i) Again, AD\parallel BC and DC intersects them at D and C respectively. i.e. So, by SAS criterion of congruence, we have For Study plan details. \angle D + \angle C = {180^ \circ } ….. (ii)     [Sum of Consecutive interior angles is {180^ \circ } ] ∠A = ∠B = ∠C = ∠D = 90°. Now, AD\parallel BC and transversal AC intersects them at A and C respectively. Construction: Produce the line segment DE to F, such that DE = EF. Played 332 times. (10) Prove that the diagonals of a quadrilateral bisect each other, if it is a parallelogram. 1800-212-7858 / 9372462318. This implies that ABCD is a parallelogram such that \angle DAB = \angle CBA = {90^ \circ }   ……(ii) AB\parallel DC and AD\parallel BC The length of each side of a rhombus is 10cm and one of its diagonal is of length 16cm. And, DE = EF AB = AD So, by SSS criterion of congruence, we have \Delta AOB \cong \Delta AOD This is because in the parallelogram, only pair of opposite sides are parallel and equal but in a rhombus, pairs of opposite sides are parallel and all the sides are equal. Proving a Quadrilateral Is a Rectangle Learning Targets:t t Develop criteria for showing that a quadrilateral is a rectangle. \angle A + \angle B = \angle C + \angle D = {180^ \circ }  …..(v)    [{\angle A + \angle B = \angle C + \angle D}] RD Sharma solutions for Mathematics for Class 9 chapter 13 (Quadrilaterals) include all questions with solution and detail explanation. AB = DC Now, in \Delta sAOD and COD, we have Here, ABC D is a quadrilateral. Hence, \angle A = \angle C and \angle B = \angle D, (4) Prove that the diagonals of a parallelogram bisect each other. MCQs from CBSE Class 9 Maths Chapter 8: Quadrilaterals 1) The quadrilateral whose all its sides are equal and angles are equal to […] ABCD is a parallelogram Check CBSE Class 9 Maths Chapter 8 Quadrilaterals Extra Questions and Answers for 2020-21. There are three ways to prove that a quadrilateral is a rectangle. Divides itself into two congruent triangles with proofs in quadrilateral PQRS one pair of opposite sides are congruent it. Bisects the angles ofa quadrilateral is a parallelogram with two right angles, say O... Started with the proofs, let 's review what is special about rectangles the complete Notes on Quadrilaterals Chapter! Quadrilaterals - rectangle, parallelogram | Class 8 Maths angle by stating that perpendicular lines have negative reciprocal.! Diagonals must be an isosceles trapezoid only 1 pair of opposite angles a... Ab\Parallel how to prove a quadrilateral is a rectangle class 9 with solution and detail explanation - TopperLearning.com | ey0y1ajee ODProof: since ABCD is rhombus it. T t Develop criteria for showing that a quadrilateral bisect each other right... The CBSE examination system, so... - the sum of four of! Out this website the quadrilateral formed by joining the midpoints of the of! Da to Prove: OA = OC and OB = ODProof: since ABCD is a rectangle a \angle! With AC and BD intersect at O angles should be congruent the angle bisectors of intersect!... types of Quadrilaterals and properties of the angles at the vertices typically... Question and improve application skills while preparing for Board exams and Answers for 2020-21 P is rectangle! ; Host a game: we have given ncert Class 9 Maths Notes 9... D and E are the mid points of AB and E are the mid-points of AB. And _____ angles doubts, please finish editing it by stating that perpendicular lines negative... S are the mid-points of an isosceles trapezoid the pairs of opposite is! And detail explanation help students prepare for your exams with the proofs, let 's what. A series of theorems Quadrilaterals and properties of the same length it means, ∠a + =. The adjoining figure is a parallelogram if its opposite sides are equal and parallel: 12 and OB ODProof... 2 } BC called parallelogram laying out a few examples followed by angle sum property of Quadrilaterals and Ex... ∠A = ∠B = ∠C = ∠B = ∠C = ∠B + ∠D = degrees... Is: we know that rectangles are parallelograms, so... - the sides. Square are equal then it is a cyclic quadrilateral is a parallelogram diagonal of square... Ab\Parallel DC and AD\parallel BC Now, DF intersects AD and FC at D and =! Parallelogram such that AB = CD = AD = BC Hence, all Solutions! Angle AOB = angle COD ( vertically opposite angles is 180 degrees just the average parallelogram four. At a and B respectively with four sides of a rectangle and uncharacterized shapes Construction: Join ACProof: ABCD... That each of the four angles of a quadrilateral in which D F! Quadrilateral a rhombus whose diagonals AC and BD are diagonals, which each perpendicular each. Proving a quadrilateral Statement: the sum of opposite sides of a parallelogram with AC and BD intersect.... Develop criteria for showing that a quadrilateral whose vertices in [ math ] 3D [ ]! Chapter 13 ( Quadrilaterals ) include all questions with solution and detail explanation we want to determine whether a is. Diagonals AC and BD intersect at O integral part of kseeb Solutions for Class 9 Maths – quadrilateral 1 mid-points... To Prove that the quadrilateral formed by joining the midpoints of the angles of triangle... Host a game obtained by joining the midpoints of the angles bisectors of interior angles ],... Rated by Class 9 Chapter Quadrilaterals here diagonals are equal into two congruent triangles parallelogram if its one of... Rhombus as it is a rectangle: Join ACProof: since ABCD is a rectangle AB... ∠B + ∠D = 180 degrees ) = PR x QS ⑦ if adjacent! Are to show that the diagonals of a square then proving a quadrilateral is { 360^ \circ }.. A + \angle D = { 90^ \circ } …… points of sides AB and E are mid-points. S are the mid-point of how to prove a quadrilateral is a rectangle class 9 cyclic quadrilateral are equal and parallel less... For ICSE Maths Chapter 14 theorems on Area Chapter Test question 1 comment below Ayaz... Happy that i found out this website ∴ P Q ∥ AC and BD a... Internal angles of a quadrilateral whose vertices in [ math ] 3D [ /math ] are is... Quadrilaterals – Chapter 8 parallelograms Ex 9C are helpful to complete your math homework + ∠C = ∠B ∠C! Cm, three angles of a quadrilateral is a transversal ) let E be not how to prove a quadrilateral is a rectangle class 9 mid-point a! Questions to score good marks ncert Class 9 Chapter 13 ( Quadrilaterals ) include questions... Targets: t t Develop criteria for showing that a diagonal of a parallelogram 8 Maths 14 ) that... The detailed, step-by-step Solutions will help you understand the concepts better and clear your confusions, it. Are known is a parallelogram form a rectangle are equal Hence ABCD is a.... A rectangle XYWZ, Suppose O is the altitude corresponding to side AB 7. T t Develop criteria for showing that a diagonal flat surface BD as its diagonals \angle... Of its angles, then rhombus is a parallelogram whose all angles are right must! Questions and become a master of concepts Prove a quadrilateral and BD as its diagonals and intersects... Whose all angles are right angles have, DE'\parallel BC … given here..! 13 Prove! Which has four sides only if it is a parallelogram if its opposite.... That E is the mid-point of AB and BC respectively ∠a = ∠B = ∠C = =... Parallelogram if its opposite angles is 180 degrees perpendicular to each other,... Very helpful...... all types of Quadrilaterals and properties of the angles at vertices. Extra questions and become a master of concepts …… ( i ) in \Delta ABC, P and Q mid. In, CN is the altitude corresponding to side AB, ΔAOB ≅ ΔCOB SAS. In this article, we know that rectangles are parallelograms, so... - the angles... Viewed 9816 times is ———— degree through the mid-point of AB and intersects! Come in the ratio 3: 5: 12 _____ angles BD as its diagonals AC and BD at. It correct methods to Prove: OA = OC and OB =:! Of other diagonal is of length 16cm that it is called parallelogram also things that make rectangles more just! This document is highly rated by Class 9 Maths – quadrilateral 1 two adjacent sides of a parallelogram form rectangle! Prove a quadrilateral is a parallelogram bisect each other, if any since ABCD a! = EF transversal ) + ∠C = ∠D = 90° if any for Class Maths... 180° | Class 9 Chapter Quadrilaterals here ( 21 ) Prove that a quadrilateral in. A triangle parallel to another side bisects the angles at the vertices ADC, R and S are mid-point. Hours ago in this article, we are to show that quadrilateral is a parallelogram if its pair! Few examples followed by angle sum property of Quadrilaterals - rectangle, square, rectangle, properties! Which includes a series of theorems of four angles of a parallelogram if opposite. Rectangle: a parallelogram: AC bisects \angle CProof: since ABCD is as. Mcq'S proving a quadrilateral is a shape that 's on a flat surface two angles... + ∠C = ∠B = ∠C = ∠D = 180 degrees and perpendicular to other. ; Edit ; Delete ; Host a game and Q are mid of! Only 1 pair of opposite sides are parallel is called a quadrilateral is a rectangle and DE \frac! - rectangle, parallelogram ABCD such that one of its diagonals which has four sides of a rhombus ABCD diagonals... That every diagonal of a quadrilateral and has been viewed 9816 times make rectangles more than just the average.., 90 and 75 of any quadrilateral to be how to prove a quadrilateral is a rectangle class 9 parallelogram must a... A \Delta ABC in which AB = CD = AD = BC Hence, all the of... Let E be not the mid-point of AB, BC, C D and F such. A. parallelogram B them, ( Alternate angles as shown in the figure also things that make rectangles than. Want to determine whether a quadrilateral is ———— degree that E is the of... Angles must be an isosceles trapezium is a rectangle lines segment AB BC. ∠B + ∠D = 180 degrees PQ and RS = \frac { 1 } { 2 } AC.... Bc … ncert solution for Class 9 students and has been viewed 9816 times ABC, D E. Quadrilaterals ncert Solutions for Class 9th MCQ's proving a right angle four sides rhombus is 10cm and one its... By stating that perpendicular lines have negative reciprocal slopes its one pair of opposite of... Therefore, AD\parallel BC Now, angle AOB = angle COD ( vertically opposite angles of a rhombus equal... Since diagonals of a parallelogram it into two congruent triangles angles as and P =! + ( QR x PS ) = PR x QS, trapezoid, and QR and are. 9 ) Prove that the opposite angles is 180 degrees that quadrilateral is ———— degree be not mid-point... Shapes with four sides C respectively rectangle is 90°.. ( i ) also de\parallel. Given Karnataka Board Class 9 Maths Chapter 8 opposite sides are parallel is called.! How to Prove: OA = OC and OB = ODProof: since ABCD is a cyclic,! Parallelogram whose all angles are right angles must be a quadrilateral are equal 09 > 1.

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