Question

ABCD is a quardilateral in which all the four angles are equal. show that AB parallel CD and AD parallel BC.

Answer 1

It is a square because all are having equal angle

Answer 2

As the two sides AB and CD are parallel and AD is parallel to BC the figure formed is a PARALLELOGRAM.
In parallelogram the opposite sides are always equal and parallel .
Therefore AB is parallel to CD and AD is parallel to BC.
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