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

The sum of all angles of a quadrilateral is

The sum of all the angles of a quadrilateral is

The sum of four angles of a quadrilateral is

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

Sum of the angles in a quadrilateral is ……….

The sum of angles of a concave quadrilateral is

What are the auxiliary formulae of the statement "sum of the angles of a quadrilateral ABCD is 360^(@) ," (The four angles of the quadrilateral are A,B,C and D)?

Theorem 1the sum of the angles of a quadrilateral is 360^(@) or 4 right angles.