# 9.5: Angle Classification

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**Practice**Angle Classification

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Color | Highlighted Text | Notes | |
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Term | Definition |
---|---|

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 . |

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Description

Classify acute, right, obtuse, and straight angles.

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Date Created:

Oct 29, 2012
Last Modified:

Sep 09, 2016
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