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. As an added challenge, have students complete the Exterior Angles of Triangles: Solve for the Variable worksheet next!