Question

9. Using the angle the angle sum property of a triangle, find the beamy sum of
the angles of an quadrilateral​

Answer 1

Step-by-step explanation:

We know that the sum of the angles of a triangle is 180°. ⇒ ∠A + ∠B + ∠C + ∠D = 360° [using (i) and (ii)]. Hence, the sum of all the four angles of a quadrilateral is 360°.