Unit 2c: Theorems With Triangles

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Source: Topic 2 Day 3

Last updated 5:06 AM on 10/18/26

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1

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Triangle Angle-Sum THeorem

The sum of the measures of a triangle is = 180 degrees

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Exterior Angles

Angle formed by a side and an extension of an adjacent side

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Remote Interior Angles

The 2 non-adjacent interior angles to the exterior (INSIDE triangle, not touching the angle outside)

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Triangle Exterior Angle Theorem

The measure of each EXTERIOR ANGLES of a triangle equals the sum of the measures of its TWO REMOTE INTERIOR ANGLES