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

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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 proves that AOB is a line.

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

Equation,

(Angles around a point)

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