The Exterior Angle Theorem
Grade 745 min
Learning Objective
I can use the exterior angle theorem to solve for missing angle measures in triangles.
Lesson Flow
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Exterior Angle Theorem — Formula & Examples
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Practice
2 questions • Short answer
Exit Ticket
“In triangle ABC, the measure of exterior angle A is 130°. If the measure of angle B is 65°, find the measure of angle C. Show your work. In triangle XYZ, the measure of exterior angle X is 115°. If the measure of angle Y is 50°, find the measure of angle Z. Show your work. In triangle PQR, the measure of exterior angle P is 120°. If the measure of angle Q is 72°, find the measure of angle R. Show your work.”
Teacher Guide
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- Answer keys for all questions
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