## 7 - 8 WU98 Prove exterior angles 2.docx - Section 1: Warm Up

7 - 8 WU98 Prove exterior angles 2.docx

# Prove exterior angles of triangles 2

Unit 7: PARALLEL LINES, TRANSVERSALS, AND TRIANGLES
Lesson 8 of 9

## Big Idea: More practice proving a tough-to-prove fact about triangles, using transversals.

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2 teachers like this lesson
Standards:
Subject(s):
Math, Geometry, 8th grade, properties of triangles, reasoning and proof, Triangle Exterior Angle Theorem
75 minutes

### Jeff Li MTP

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