Question

In the given figure, the value of y is

(a) 20°

(b) 30°

(c) 45°

(d) 60°

Answer 1

In the given figure,and are vertically opposite angles, therefore, these must be equal.

That is,

...(i)

Also,, and form a linear pair. Therefore, their sum must be supplementary.

That is,

From (i) equation, we get:

From (i) equation again,

Hence, the correct choice is (b).