Question

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

1 point

70°

80°

100°

90°

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Answer 1

Answer:

Sum of adjacent angles in parallelogram = 180°

So here,

∠A + ∠B = 180°

∠B = 180 - 80

     = 100°

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Answer 2

Given:-

• ∠A of parallelogram ABCD is 80°.

To find:-

• ∠B of parallelogram ABCD.

Solution:-

We know that,

Sum of two adjacent angles of parallelogram is 180°.

So,

→ ∠A + ∠B = 180°

→ 80° + ∠B = 180°

→ ∠B = 180° - 80°

→ ∠B = 100°.

Therefore,

∠B of parallelogram ABCD is 100°.

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More properties of parallelogram:-

• Opposite angles of parallelogram are equal.
• Opposite sides of parallelogram are equal and parallel.
• Diagonals bisect each other.
• Sum of all interior angles of parallelogram is 360°.