# NCERT Class 9 Solutions: Line and Angles (Chapter 6) Exercise 6.1 – Part 2

Q-3 In the figure, , then prove that

Solution:

• In figure give point of P,Q,R,S,T and

To prove,

Equation,

• (Linear Pair)

…………equation (1)

• also,

(Linear Pair)

………..equation (2)

• From (i) and (ii)

• Therefore,

Q-4 In the figure, if , then prove that AOB is a line.

Given, point of A,B,C,D and angle of w, x, y, z

To Prove,AOB is a line (linear pair.)

Equation, (Angles around a point.)

Hence, makes a linear pair. Therefore, AOB is a staright line.

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