Posted on - 06-02-2017

Bank PO

**Fig****.10**.

- Any four sided figure is called a quadrilateral. .
- The sum of four angles of a quadrilateral is equal to 360°. .
- The area of a quadrilateral = 1/2 x one diagonal x sum of perpendiculars to the diagonal from the opposite vertices. .
- If the four vertices of a quadrilateral lie on the circumfer-ence of a circle (i.e., if the quadrilateral can be inscribed in a circle) it is called a cyclic quadrilateral. In a cyclic quad-rilateral, sum of opposite angles = 180° i.e., A + C = 180° and B + D = 180°.

**Fig****.11**.