Inscribed Circle (Inradius)
Side a
Side b
Side c
The incircle calculator finds the inscribed circle radius for a triangle with given side lengths.
- 1Inradius r = Area / s where s = semi-perimeter
- 2Area computed by Heron's formula
- 3The incircle touches each side exactly once
- 4Larger triangles with shorter perimeters have larger inradii
3, 4, 5 right triangle=Inradius = 1
Equilateral side 6=Inradius = 6/(2√3) ≈ 1.732
| Triangle Type | Sides | Inradius |
|---|---|---|
| Right | 3,4,5 | 1.00 |
| Right | 5,12,13 | 2.00 |
| Equilateral | 6,6,6 | 1.73 |
| Isosceles | 5,5,6 | 1.50 |
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