Friday, October 28, 2016

The measure of an exterior angle of a triangle equals the sum of the measures of the two nonadjacent interior angles

Given
Triangle ABC
Exterior angle of a triangle
Exterior angle of a triangle

  - Two adjacent angles form a straight line (BC)

Prove


Proof

2: - If the exterior sides of two adjacent angles form a straight line, these angles are supplementary

 - From 1 and 2

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