" 17.Prove that all angles of a quadrilateral are equal to "360^(@)" ."

The sum of all angles of a quadrilateral is

Prove that the sum of the angles of a quadrilateral is 360^(@) .

Prove that the sum of angles of any convex quadrilateral is 360^(@) .

The sum of all the angles of a quadrilateral is

The sum of the four angles of a quadrilateral is 360^(@) . Three angles of a quadrilateral are respectively equal to 110^(@), 50^(@) and 40^(@) . Find its fourth angle.

If all sides of a quadrilateral are equal, it is a __________.

Prove that any outer angle of a cyclic quadrilateral is equal to the inner angle at the opposite vertex.

Prove that any outer. angle of a cyclic quadrilateral is equal to the interior angle, at the opposite vertex.

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^(@) .