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GeomBench
The largest circle that fits inside your shape.
A triangle's inradius is its area divided by its semiperimeter (r = Area ÷ s) — a direct consequence of the fact that the incircle touches all three sides, splitting the triangle into three smaller triangles whose combined area equals the whole.
For a regular polygon, the inradius is also called the apothem, and it has a clean closed form (s ÷ (2·tan(π/n))) — no need for the more general triangle formula.
Inradius
1.633
What you entered
Semiperimeter s = (a + b + c) ÷ 2
(5 + 6 + 7) ÷ 2= 9Area (Heron's formula) = √(s(s−a)(s−b)(s−c))
√(9 × 4 × 3 × 2)= 14.6969Inradius = Area ÷ s
14.6969 ÷ 9= 1.633Result
Inradius: 1.633
The inradius (radius of the largest circle that fits inside) is 1.633 units.