Geometry
Triangle Area (Heron)
Area from three side lengths.
Formula
Formula
A = √s(s−a)(s−b)(s−c), s = a+b+c2
Variables
| Symbol | Definition | Type & range | Units | Role |
|---|---|---|---|---|
| a, b, c | side lengths | real number (ℝ) | — | input |
| s | semi-perimeter | computed result | — | result |
Try it yourself
Interactive calculator
Worked examples
Example 1
Givena = 3, b = 4, c = 5
Result6
Example 2
Givena = 7, b = 8, c = 9
Result26.83281573