Question

Write and prove angle sum property Theorem​

Answer 1

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• Theorem 1: Angle sum property of triangle states that the sum of interior angles of a triangle is 180°. Proof: Consider a ∆ABC, as shown in the figure below. To prove the above property of triangles, draw a line \overleftrightarrow {PQ} parallel to the side BC of the given triangle.

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Answer 2

Step-by-step explanation:

In a triangle angleA + angleB +angleC= 180°

in a quadrilateral the sum of the interior angles equals to 360° we can also use the angle sum property of the triangle in a quad. by drawing a diagonal cutting the quad. into two triangles..

just google it once if u didn't understand what i said but if u understand pls mark me as brainliest