Worksheet

Finding Exterior Angles of Triangles

Finding Exterior Angles of Triangles

Model how to find a missing exterior angle with this eighth-grade geometry worksheet! The Triangle Exterior Angle Theorem states that the measure of an exterior angle of a triangle is equal to the sum of the two opposite interior angles. With two pages of practice problems, this worksheet will give students practice using this theorem to find missing exterior angles of triangles. Students can learn to apply another triangle theorem, the Triangle Angle-Sum Theorem, by completing the Finding Missing Angles in Triangles worksheet.

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