Question

Short form of angle sum property of triangle.​

Answer 1

Answer:

In the given triangle, ∆ABC, AB, BC, and CA represent three sides. A  B and C are the three vertices and ∠ABC, ∠BCA and ∠CAB are three interior angles of ∆ABC. Theorem 1 : Angle sum property of triangle states that the sum of interior angles of a triangle is 180°.