The sum of the angles in the four segments exterior to a cyclic quadrilateral is equal to `540^@`

The sum of the angles in the four segments exterior to a cyclic quadrilateral is equal to 6 right angles.

Prove that the sum of the angles in the four segments exterior to a cyclic quadrilateral is equal to 6 right angles.

Interior and exterior of a quadrilateral

The sum of the angles of a quadrilateral is

The sum of angles of a concave quadrilateral is

Assertion (A) : If in a cyclic quadrilateral ,one angle is 40^(@) ,then the opposite angle is 140^(@) . Reason (R ) : Sum of opposite angle in a cyclic quadrilateral is equal to 360^(@) .