Question

prove angle sum property and exterior angle property

Answer 1

Theorem 1: Angle sum property of triangle states that the sum of interiorangles of a triangle is 180°. Proof: Consider a ∆ABC, as shown in the figure below. To prove the aboveproperty of triangles, draw a line parallel to the side BC of the given triangle. Thus, the sum of the interiorangles of a triangle is 180°. hence proved

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Answer 2

1:angle sum property of a traingle..
2: exterior angle sum property