3 Sides Triangle Area Calculator
Result
3 Sides Triangle Area Calculator This calculator finds the area of a triangle from the lengths of its three sides using Heron's formula. Enter sides a, b, and c, and it computes the semi-perimeter s = (a + b + c) / 2 and then the area A = √[s(s − a)(s − b — free online calculator.
Formula
- Triangle area from three sides calculator. Apply the geometric relationship below and use the worked example to verify the setup.
- The main inputs are Side A, Side B, Side C. Enter them in the units and format shown in the calculator.
- Keep comparable quantities in compatible units whenever the formula combines or compares them.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: 3 Sides Triangle Area
- Side A: 3
- Side B: 4
- Side C: 5
For sides 3, 4, 5: s = 6 and A = 6.
Sample result: Calculating…
Frequently asked questions
What does the 3 Sides Triangle Area calculate?
The three side lengths must satisfy the triangle inequality.
Which values should I enter?
Enter Side A, Side B, Side C using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: s=(a+b+c)/2; Area=√(s(s−a)(s−b)(s−c)).
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.