Question

prove that the sum of the angles of a Quadirateral is equal to four right angles​

Answer 1

lets imagine that all angles of quadirateral Is x,y,z,a.

x + y + z + a = 360° ( as the summer of all angles of a quadirateral is 360° )

sum of four quadirateral is equal to 360 degrees .

hence the sum of the angles of a quadrilateral is equal to four right angles