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Big Ideas Math Integrated I, 2016 View details

1. Angles of Triangles

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Exercise 3 Page 587

Think about the interior and exterior angles of a triangle.

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How the angle measures of a triangle are related depends on what kind of angles one is looking at.

Interior angles

According to the Triangle Sum Theorem, the sum of the measures of the interior angles of a triangle is 180^(∘).

Exterior angles

According to the Exterior Angle Theorem, the measure of an exterior angle of a triangle is equal to the sum of the measures of the two nonadjacent interior angles.