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9.6: Supplementary and Complementary Angle Pairs

Difficulty Level: At Grade Created by: CK-12
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Vocabulary

Acute Angle

An acute angle is an angle with a measure of less than 90 degrees.

Complementary angles

Complementary angles are a pair of angles with a sum of 90^{\circ}.

Obtuse angle

An obtuse angle is an angle greater than 90 degrees but less than 180 degrees.

Straight angle

A straight angle is a straight line equal to 180^{\circ}.

Supplementary angles

Supplementary angles are two angles whose sum is 180 degrees.

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MAT.GEO.138.5.L.1