Question

What is the angle sum property?

Answer 1

Angle sum property of the triangle.

The angle sum property of a triangle states that the sum of interior angles of a triangle is equal to $180°$.

In a triangle $∆PQR$, $\angle P+\angle Q+\angle R=180°$

All triangles will satisfy the angle sum property.

Some triangles shown below,

Hence, the angle sum property of the triangle says that the sum of all three interior angles is equal to $180°$.