# Isosceles Triangle

An isosceles triangle is a triangle having (at least) two sides of equal length, and therefore also with (at least) two equal angles.

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

### Examples

Equilateral Triangle: | A triangle in which all three sides are of equal length. In such a triangle, the angles are all equal as well. |

### Prerequisites

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. |

Triangle: | A triangle is a three-sided (and three-angled) polygon. |