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ANGLES IN TRIANGLES

The angle formed between two adjacent sides of a triangle is called an interior angle. The sum of all of the measures of the interior angles in a triangle is 180∘.

An angle formed between a side of the triangle and an adjacent side extending outward is called an exterior angle. The exterior angle of a triangle is equal to the sum of the two opposite interior angles.

Angles in Triangles

In the above diagram a, b, and c are the interior angles. x, y, and z are the exterior angles

ANGLES IN TRIANGLES WORKSHEETS

Interior and Exterior Angles- Chart

Verifying Angles - Form a Triangle

Find the Missing Interior Angle - Level 1

Find the Missing Interior Angle - Level 2

Find the Missing Exterior Angle - Level 1