# 9.5: Angle Classification

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**Practice**Angle Classification

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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 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 .### Image Attributions

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Classify acute, right, obtuse, and straight angles.

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Date Created:

Oct 29, 2012
Last Modified:

Aug 16, 2016
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