NCERT Grade 9-Lines and Angles-Questions

NCERT Solutions for Class 9 Maths

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Lines and Angles

Exercise 1

1.    In Fig. 6.13, lines AB and CD intersect at O. If ∠ AOC + ∠ BOE = 70 and ∠ BOD = 400, find ∠BOE and reflex ∠COE.

2.   In Fig. 6.14, lines XY and MN intersect at O. If ∠POY = 900 and a : b = 2 : 3, find c.

3.   In the given figure, ∠PQR = ∠PRQ, then prove that ∠PQS = ∠PRT.

4.   In Fig. 6.16, if x + y = w + z, then prove that AOB is a line.


5.    In the given figure, POQ is a line. Ray OR is perpendicular to line PQ. OS is another ray lying between rays OP and OR. Prove that 

Exercise 2

6.   It is given that ∠XYZ = 640 and XY is produced to point P. Draw a figure from the given information. If ray YQ bisects ∠ZYP , find ∠XYQ and reflex ∠QYP.

7.   In the given figure, find the values of x and y and then show that AB || CD.

8.   In the given figure, if AB || CD, CD || EF and y : z = 3 : 7, find x.


9.   In the given figure, If AB || CD, EF ⊥ CD and ∠GED = 1260, find ∠AGE , ∠GEF and ∠FGE.

10.  In the given figure, if PQ || ST, ∠PQR = 1100 and ∠RST = 1300, find ∠QRS.

[Hint: Draw a line  parallel to ST through point R.]

11.  In the given figure, if AB || CD, ∠APQ = 500 and ∠PRD = 1270, find x and y.

12.  In the given figure, PQ and RS are two mirrors placed parallel to each other. An incident ray AB strikes the mirror PQ at B, the reflected ray moves along the path BC and strikes the mirror RS at C and again reflects back along CD. Prove that AB || CD.

Exercise 3

13.  In the given figure, sides QP and RQ of ΔPQR are produced to points S and T respectively. If ∠SPR = 1350 and ∠PQT = 1100, find ∠PRQ.

14.  In the given figure, ∠X = 620, ∠XYZ = 540. If YO and ZO are the bisectors of ∠XYZ and ∠XZY respectively of ΔXYZ, find ∠OZY and ∠YOZ.

15.  In the given figure, if AB || DE, ∠ ∴ BAC = 350 and ∠CDE = 530, find ∠DCE.

16.  In the given figure, if lines PQ and RS intersect at point T, such that ∠PRT = 400, ∠RPT = 950 and ∠TSQ = 750, find ∠SQT.


17.  In the given figure, if PQ ⊥ PS , PQ || SR, ∠SQR = 280 and ∠QRT = 650, then find the values of x and y.

18.  In the given figure, the side QR of ΔPQR is produced to a point S. If the bisectors of ∠PQR and ∠PRS meet at point T, then prove that 

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