# No 3 sum

Hi!

Here is the answer to your question.

It is known that adjacent angles of a parallelogram are supplementary.

It is known that opposite angles of a parallelogram are equal.

∴∠A = ∠C = 72° and ∠B = ∠D = 108°

Cheers!

**
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Hi!

Here is the answer to your question.

It is known that adjacent angles of a parallelogram are supplementary.

It is known that opposite angles of a parallelogram are equal.

∴∠A = ∠C = 72° and ∠B = ∠D = 108°

Cheers!

**
**

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