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Sum of the Angles in a Triangle

Introduction

In our first lesson we are going to investigate the sum of the interior and exterior angles in a triangle. Key words: Angle Triangle Sum Interior Exterior

Interior Angles in a Triangle

What do you notice about the interior angles in a triangle?

Describe the relationship in words, a formula or both

Exterior Angles in a triangle

What do you notice about the exterior angles in a triangle?

Describe the relationship in words, a formula or both.