Geometry & Trigonometry
Advanced

Inradius

Radius of a triangle inscribed circle.

Formula

r=Ksr = \frac{K}{s}

Variables

KArea
sSemi-perimeter

Example

Largest circle that fits inside

Did You Know?

A triangle's inradius equals its area divided by its semiperimeter — the radius of the largest circle that fits inside.

trianglecircle