Triangle Calculator

Calculate area, perimeter, and angles of triangles from three sides (Heron's formula) or base and height.

A = \frac{1}{2}bh; \quad A = \sqrt{s(s-a)(s-b)(s-c)} \quad \text{ where } s = \frac{a+b+c}{2}

Result

Calculates triangle metrics. If three sides are provided, Heron's formula computes area, and the law of cosines is used to determine internal angles.