Question

Prove that the sum of four angles of a quadrilateral ABCD is 360°.
(Hint: Draw diagonal BD by joining the points B and D and use angle sum property of a triangle for two triangles
formed.]​

Answer 1

Answer:

Answer is literally in the Hint

BDC is a triangle so it's 180 degree

Similarly BDA is also triangle it's also 180 degree

BDC+BDA=180+180=360 degree