## 7 - 8 Prove exterior angles 2_video narrative_POTD.MOV - Section 2: Play of the Day

7 - 8 Prove exterior angles 2_video narrative_POTD.MOV

# 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.

Print Lesson
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

##### Similar Lessons

###### Developing Right and Straight Angle Intuition
8th Grade Math » Lines, Angles, and Algebraic Reasoning
Big Idea: Introduce and explore the connections between supplementary and complementary angles using algebra.
Favorites(13)
Resources(14)
New York, NY
Environment: Urban

###### PTA (Parallel Lines, Transversals and Angles)
Geometry » Line-sanity!
Big Idea: Students will draw and measure to discover relationships of angles formed by parallel lines cut by a transversal.
Favorites(21)
Resources(20)
Saratoga Springs, NY
Environment: Suburban