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9.5: Angle Classification

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.

Obtuse angle

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

Perpendicular

Perpendicular lines are lines that intersect at a 90^{\circ} angle. The product of the slopes of two perpendicular lines is -1.

Right Angle

A right angle is an angle equal to 90 degrees.

Straight angle

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

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Oct 29, 2012
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Sep 09, 2016
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