# Angle

An angle is a measure of the amount of rotation about the point of intersection of two lines or line segments that is required to bring one into correspondence with the other.

Angle is an elementary-school-level concept. It is listed in the California State Standards for Grade 3.

### Examples

Acute Angle: | An acute angle is an angle that measures less than 90 degrees. |

Obtuse Angle: | An obtuse angle is an angle that measures greater than 90 degrees and less than 180 degrees. |

Right Angle: | A right angle is an angle that measures exactly 90 degrees. |

### Prerequisites

Line: | A line is the infinite extension in both directions of a line segment, giving the path of shortest distance between two points in Euclidean space. |