Question

Prove that the sum of all angles of a quadrilateral is 360°(therem)

Answer 1

Answer:

If we draw one diagonal to quadrilateral we will get two triangles i.e. △ABC and △ACD and we know that sum of the angles of a triangle is 180°

Sum of angles of quadrilateral ABCD=sum of angles of △ABC + sum of the angles △ACD

= 180°+180°

=360°