Question

यदि l || m हो, तब a का मान होगा

(A) 32°

(B) 72°

(C) 20°

(D) 16°

Answer 1

Correct option is (C) 20°

Given, 

\(l\ \|\ m\)

So, Corresponding angles are equal.

\(3 a+60^{\circ} =4 a+40^{\circ}\)

\(3 a-4 a =40^{\circ}-60^{\circ} \)

\(-a =-20^{\circ}\)

\(a =20^{\circ}\)

Answer 2

सही विकल्प है (C) 20°