Walking Around a Triangle

Unit 5: Lines, Angles, and Algebraic Reasoning
Lesson 8 of 16

Objective: SWBAT construct a simple argument to utilize the AA theorem of similarity and explain the exterior angle theorem of triangles.

Big Idea: In this investigation we open with AA criterion for triangles and help students discover that the exterior angles of a triangle (and any polygon) must always add to 360.

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