Compute triangle area from three sides using Heron's formula with triangle inequality validation.
Heron's formula computes the area of a triangle when you know all three sides. It first calculates the semi-perimeter, then uses it in a square root expression. The sides must satisfy the triangle inequality.
Semi-perimeter
s = (a + b + c) / 2
Heron's Formula
A = √(s(s−a)(s−b)(s−c))
The calculator rejects the input with a clear error explaining the triangle inequality violation.
Yes — it gives the exact area for any valid triangle. Floating-point precision may introduce tiny rounding in extreme cases.