Question

find the measure of all angle's of a parallelogram ABCD,if m<D=60degre. ​

Answer 1

If <D is 60°, then <B will be also 60°.

[opposite angles of a parallelogram are equal]

so <A=<C.

We know that <A+<D=180° (sum of two adjacent angles in parallelogram is 180°)

<A+60°=180°

<A=120°

so <C = 120°

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