Question

Write two angle properties of a triangle. Prove that the sum of all angles in a triangle is 180 degree.

Answer 1

Step-by-step explanation:

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

Answer 2

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