Question

In the parallelogram abcd, angle=100.find the measure of angle B=D

Answer 1

In a parallelogram angle A + B = 180° [co-interior angles]
100 + B = 180°
B = 80°

Since, opposite angles of a parallelogram are equal
Angle B = D = 80°

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Answer 2

ABCD parallelogram
sum of all angles= 360
angle A =100
so angle C = 100
angle B = angle D
A + B + C + D = 360
100 + 100 + 2*B =360
200 + 2*B = 360
2*B = 160
B = 80