## spherical geometry.jpg - Section 3: Lesson End

spherical geometry.jpg
spherical geometry.jpg

# Why Do Triangles Have 180 Degrees?

Unit 5: Lines, Angles, and Algebraic Reasoning
Lesson 7 of 16

## Big Idea: Students realize that triangles are the basis for defining all angle measure.

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Standards:
55 minutes

### Shaun Errichiello

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