# Altitude of a triangle

##### This online calculator computes the length of a altitude of a triangle, given the lengths of edges of a triangle.

As usual, triangle edges are named "a" (edge BC), "b"(edge AC) and "c"(adge AB).

Altitude of a triangle to edge "c" can be found as:

where S - area of a triangle, which can be found from three known edge using, for example, Hero's formula, see Calculator of area of a triangle using Hero's formula

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