#### Chapters

## Chapter 5: Quadrilaterals

#### Balbharati solutions for Balbharati Class 9 Mathematics 2 Geometry Chapter 5 Quadrilaterals Exercise Practice Set 5.1 [Page 62]

Diagonals of a parallelogram WXYZ intersect each other at point O. If ∠XYZ = 135° then what is the measure of ∠XWZ and ∠YZW ?

If l(OY)= 5 cm then l(WY)= ?

In a parallelogram ABCD, If ∠A =(3x + 2)° , ∠B = (2x - 32)° then find the value of x and then find the measures of ∠C and ∠D.

Perimeter of a parallelogram is 150 cm. One of its sides is greater than the other side by 25 cm. Find the lengths of all sides.

If the ratio of measures of two adjacent angles of a parallelogram is 1 : 2, find the measures of all angles of the parallelogram.

Diagonals of a parallelogram intersect each other at point O. If AO = 5, BO = 12 and AB = 13 then show that

`square`ABCD is a rhombus.

In the given figure, `square` PQRS and `square` ABCR are two parallelograms. If ∠P =110° then find the measures of all angles of `square` ABCR.

In the given figure, `square` ABCD is a parallelogram. Point E is on the ray AB such that BE = AB then prove that line ED bisects seg BC at point F.

#### Balbharati solutions for Balbharati Class 9 Mathematics 2 Geometry Chapter 5 Quadrilaterals Exercise Practice Set 5.2 [Page 67]

`square` ABCD is a parallelogram, P and Q are midpoints of side AB and DC respectively, then prove `square` APCQ is a parallelogram.

Using opposite angles test for parallelogram, prove that every rectangle is a parallelogram.

In the given figure, G is the point of concurrence of medians of Δ DEF. Take point H on ray DG such that D-G-H and DG = GH, then prove that `square` GEHF is a parallelogram.

Prove that quadrilateral formed by the intersection of angle bisectors of all angles of a parallelogram is a rectangle.(shown in the given figure)

In the given figure, if points P, Q, R, S are on the sides of parallelogram such that AP = BQ = CR = DS then prove that `square` PQRS is a parallelogram.

#### Balbharati solutions for Balbharati Class 9 Mathematics 2 Geometry Chapter 5 Quadrilaterals Exercise Practice Set 5.3 [Page 69]

Diagonals of a rectangle ABCD intersect at point O. If AC = 8 cm then find BO and if ∠CAD =35° then find ∠ACB

In a rhombus PQRS if PQ = 7.5 then find QR. If ∠QPS = 75° then find the measure of ∠PQR and ∠SRQ.

Diagonals of a square IJKL intersects at point M, Find the measures of ∠ IMJ, ∠ JIK and ∠ LJK .

Diagonals of a rhombus are 20 cm and 21 cm respectively, then find the side of rhombus and its perimeter.

State with reason whether the following statement is ‘true’ or ‘false’.

Every parallelogram is a rhombus.

State with reason whether the following statement is ‘true’ or ‘false’.

Every rhombus is a rectangle.

State with Reason Whether the Following Statement is ‘True’ Or ‘False’.

Every rectangle is a parallelogram.

State with reason whether the following statement is ‘true’ or ‘false’.

Every squre is a rectangle.

State with reason whether the following statement is ‘true’ or ‘false’.

Every square is a rhombus.

State with reason whether the following statement is ‘true’ or ‘false’.

Every parallelogram is a rectangle.

#### Balbharati solutions for Balbharati Class 9 Mathematics 2 Geometry Chapter 5 Quadrilaterals Exercise Practice Set 5.4 [Page 71]

In `square` IJKL, side IJ || side KL ∠I =180° ∠K = 53° then find the measure of ∠J and ∠L.

In `square` ABCD , side BC || side AD, side AB ≅ side DC If ∠A = 72° then find the measure of ∠ B, and ∠ D.

In `square`ABCD , side BC < side AD in following figure .

side BC || side AD and if side BA ≅ side CD then prove that ∠ ABC ≅ ∠ DCB.

#### Balbharati solutions for Balbharati Class 9 Mathematics 2 Geometry Chapter 5 Quadrilaterals Exercise Practice Set 5.5 [Page 73]

In the given figure, points X, Y, Z are the midpoints of side AB, side BC and side AC of Δ ABC respectively. AB = 5 cm, AC = 9 cm and BC = 11 cm. Find the length of XY, YZ, XZ.

In the given figure, `square` PQRS and `square` MNRL are rectangles. If point M is the midpoint of side PR then prove that,

(i) SL = LR, (ii) LN = `1/2`SQ

In the given figure, Δ ABC is an equilateral traingle. Points F,D and E are midpoints of side AB, side BC, side AC respectively. Show that Δ FED is an equilateral traingle.

In the given figure, seg PD is a median of Δ PQR. Point T is the mid point of seg PD. Produced QT intersects PR at M. Show that `(PM)/(PR) = 1/3`

[Hint: DN || QM]

#### Balbharati solutions for Balbharati Class 9 Mathematics 2 Geometry Chapter 5 Quadrilaterals Exercise Problem Set 5 [Pages 73 - 74]

Choose the correct alternative answer and fill in the blank.

If all pairs of adjacent sides of a quadrilateral are congruent then it is called ....

rectangle

parallelogram

trapezium

rhombus

Choose the correct alternative answer and fill in the blank.

If the diagonal of a square is `12 sqrt 2` cm then the perimeter of square is ......

24 cm

`24sqrt2` cm

48 cm

`48 sqrt2` cm

Choose the correct alternative answer and fill in the blank.

If opposite angles of a rhombus are (2x)^{°} and (3x - 40)^{°} then value of x is ...

100°

80°

160°

40°

Adjacent sides of a rectangle are 7 cm and 24 cm. Find the length of its diagonal.

If diagonal of a square is 13 cm then find its side.

Ratio of two adjacent sides of a parallelogram is 3 : 4, and its perimeter is 112 cm. Find the length of its each side.

Diagonals PR and QS of a rhombus PQRS are 20 cm and 48 cm respectively. Find the length of side PQ.

Diagonals of a rectangle PQRS are intersecting in point M. If ∠QMR = 50° find the measure of ∠MPS.

In the adjacent Figure ,

if seg AB || seg PQ , seg AB ≅ seg PQ, seg AC || seg PR, seg AC ≅ seg PR then prove that, seg BC || seg QR and seg BC ≅ seg QR.

In the given Figure, `square` ABCD is a trapezium. AB || DC .Points P and Q are midpoints of seg AD and seg BC respectively.

Then prove that, PQ || AB and PQ = `1/2 (AB + DC)`.

In the adjacent figure, `square` ABCD is a trapezium AB || DC . Points M and N are midpoints of diagonal AC and DB respectively then prove that MN || AB .

## Chapter 5: Quadrilaterals

## Balbharati solutions for Balbharati Class 9 Mathematics 2 Geometry chapter 5 - Quadrilaterals

Balbharati solutions for Balbharati Class 9 Mathematics 2 Geometry chapter 5 (Quadrilaterals) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Maharashtra State Board Balbharati Class 9 Mathematics 2 Geometry solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Balbharati Class 9 Mathematics 2 Geometry chapter 5 Quadrilaterals are Concept of Quadrilaterals, Parallelogram, Tests for parallelogram, Properties of Rhombus, Properties of Square, Properties of Rectangle, Concept of Trapezium, The Mid-point Theorem.

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