Question

In a parallelogram ABCD angleA=100.Find the measure of each of its anglesB, C, D

Answer 1

Angle a + angle b = 180 (they form supplementary angles)
100 + angle b = 180
angle b = 180 - 100 = 80°

angle a = angle c = 100°   (opposite angles of a parallelogram are equal)
angle b = angle d = 80°     (opposite angles of a parallelogram are equal)

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Answer 2

Dear mates here is your

➡️Opposite angels are congruent (A = C).

Angle c=100

➡️Consecutive angles are supplementary (A + D = 180°)

D=180-100=80

➡️Opposite angels are congruent (D = B).

B=80

️A+b+c+d=100+80+100+80=360

So the answer is correct