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Example – 1 In the given figure C and D are points on a semicircle described on AB as diameter. If

Solution :

Example – 2 Prove that cyclic parallelogram is a rectangle.

Given : - ABCD is a cyclic parallelogram.

To Prove : - ABCD is a rectangle.

Proof :

Statement	Reason
1.	1. Opposite angles of a parallelogram are equal.
2.	2. ABCD is a cyclic quadrilateral
3.	3. Statements (1) & (2) A parallelogram whose one angle is 900

Hence, every cyclic parallelogram is a rectangle.