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Prove that any cyclic parallelogram is...

Prove that any cyclic parallelogram is a rectangle.

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We conclude from the given information
`ABCD` is a cyclic parallelogram.
Proof:
`/_1+/_2=180^@` ...(By Opposite angles of a cyclic parallelogram)
Also, Opposite angles of a cyclic parallelogram are equal.
Thus,
`/_1=/_2`
`=>/_1+/_1=180^@`
`=>/_1=90^@`
One of the interior angle of the parallelogram is right angled.
Hence proved `ABCD` is a rectangle.
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