Question

prove that the sum of all angles of a quadrilateral is 360 degree

Answer 1

as we know that a quadrilateral has four sides

then

{2(4) - 4}90

{8-4}90

4*90

360

hence proved that the sum of angles of a quadrilateral is 360

Answer 2

hey dude join the one diagonal of the quad. then u will get 2 triangles as we know the sum of all angles of a triangle is 180 then the other triangle will also have all angles equal to 180 . mark the both equations as 1 and 2 . then add them u will get the answer