# Perimeter of a Triangle

## Description

A perimeter is a path that surrounds a two-dimensional shape. The word comes from the Greek peri (around) and meter (measure). The term may be used either for the path or its length – it can be thought of as the length of the outline of a shape. The perimeter of a circle or ellipse is called its circumference.

Related formulas## Variables

P | Perimeter of a Triangle (m) |

a | length of the side a (m) |

b | length of the side b (m) |

c | length of the side c (m) |