# Altitude of a triangle

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

As usual, triangle sides are named **a** (side BC), **b** (side AC) and **c** (side AB).

The altitude of a triangle to side **c** can be found as:

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

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