Question

If ∠A and ∠B are two adjacent angles of a parallelogram. If ∠A = 80°, then ∠B = ?​

Answer 1

Answer:

The adjacent angles in a parallelogram are supplementary.

So Angle A + Angle B = 180°.

80 + Angle B = 180°.

Angle B = 100°.

Step-by-step explanation:

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Answer 2

Answer:

B=100°

Step-by-step explanation:

angel BAM= angle ABO [by alternative angle]

angle ABO + angle ABD=180°

80°+ angle ABD =180°

angle ABD = 180° -80°

ABD=100°