#### Answers

A quadrilateral is called a cyclic quadrilateral if its all vertices lie on a circle.

The opposite angles of a cyclic quadrilateral are supplementary.

Here, quadrilateral ABCD is cyclic.

Also, ∠ A + ∠ C = 180°

and, ∠ B + ∠ D = 180°.

Posted by Ayushi Sharma(student), on 9/3/13

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Posted by Ayushi Sharma(student), on 9/3/13

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**Definition of Cyclic Quadrilateral**

- If a quadrilateral has all of its vertices lying on a circle, then it is known as a Cyclic Quadrilateral.

**More about Cyclic Quadrilateral**

- In a cyclic quadrilateral:
- 1. Opposite angles are supplementary.

2. Exterior angles are equal to the opposite interior angles.

3. The product of the two diagonals is equal to the sum of the products of opposite sides.

**Example of Cyclic Quadrilateral**

Posted by Rishabh Tripath...(student), on 14/6/13

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