# Altitude of a triangle

## Description

The altitude of a triangle is the distance from a vertex perpendicular to the opposite side. There is a relation between the altitude and the sides of the triangle, using the term of semiperimeter too.

( The semiperimeter of a triangle is half its perimeter.)

## Variables

h | Altitude to side a (m) |

a | Side corresponding to altitude h (m) |

s | semiperimeter (m) |

b | side of the triangle (m) |

c | side of the triangle (m) |