Triangle Exterior Angles and Equations
aligned to 8.g.5 Use Informal Arguments To Establish Facts About The Angle Sum And Exterior Angle Of Triangles, About The Angles Created When Parallel Lines Are Cut By A Transversal, And The Angle-angle Criterion For Similarity Of Triangles.
Learning Objective
I can write and solve equations to find missing angle measures in triangles using the exterior angle theorem.
Lesson Flow
Watch Video
Angles of Triangle: Sum of Interior Angles and Exterior Angle Theorem by @MathTeacherGon
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Practice
7 questions • Short answer
Exit Ticket
“In a triangle, two interior angles measure 40° and 65°. Find the measure of the exterior angle formed at the vertex of the third interior angle. An exterior angle of a triangle measures 130°. One of the non-adjacent interior angles measures 50°. Find the measure of the other non-adjacent interior angle. ”
Teacher Guide
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