Work out inscribed circle radius instantly with clear inputs, formula shown and shareable results.
The incircle touches all three sides. Splitting the triangle into three triangles with apex at the incentre gives Area = r·s, so the inradius is simply area divided by the semiperimeter.
Inradius
r = Area / s, s = (a + b + c) / 2
Area = 6 and s = 6, so r = 1 exactly.
Yes: r = (a + b − c)/2 where c is the hypotenuse, which also gives 1 for the 3-4-5 triangle.