Question

let ABCD is a parallelogram if a is equal to 60 degree then find a + b

Answer 1

120degree (measure of b) + 60 (measure of a) = 180 degree

Answer 2

In parallelogram, adjacent angles are supplementary & opposite angles are equal.

A + B = 180°. (adjacent angles)
B = 180° - A
B = 180° - 60°
B = 120°

B = D. (opposite angles)
So, D = 120°

So, B + D = 120° + 120° = 240°
A + B = 180°