# Exterior Angles Theorems

## Exterior angles equal the sum of the remote interiors.

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Geometry Triangle Relationships

Solve for the Unknown Remote Interior Angle
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The measure of an exterior angle of a triangle is ${81}^{\circ }$$81^\circ$. The measures of the two remote interior angles are ${42}^{\circ }$$42^\circ$ and ${x}^{\circ }$$x^\circ$. What is the measure of the unknown angle?
qid: 100161
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