Triangle Calculator
SSS triangle: Heron area, perimeter, all three angles, side class, and acute/right/obtuse.
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How to use Triangle Calculator
- Enter side a, side b, side c. Leave a field blank only when the page says the value is missing.
- Read the result rows under the form. Errors appear in the status line. Nothing is uploaded.
- Rounding follows IEEE floating point in this browser unless the page says it uses integers or BigInt.
Triangle Calculator
Heron area
| Computes | SSS triangle: Heron area, perimeter, all three angles, side class, and acute/right/obtuse. |
|---|---|
| Includes | Heron area |
| Includes | Angles |
| Includes | Classification |
| Engine | geometry |
| Upload | None |
| Advice | Arithmetic only |
What Triangle Calculator is
Inequality: a+b>c and cyclic. Area = √(s(s−a)(s−b)(s−c)). Angles from the law of cosines in degrees. 3-4-5 is right and scalene.
The formula runs in this tab. CZNull does not receive the numbers.
How this page computes
Right triangles with a missing side can use Pythagoras directly.
Entities and related jobs
SSS triangle: Heron area, perimeter, all three angles, side class, and acute/right/obtuse. Named features: Heron area, Angles, Classification.
See also Pythagorean Theorem Calculator, Circle Calculator, Rectangle Calculator.
Use cases
Plots, trusses, and school SSS cases. SAS/ASA solvers are not on this page; enter three sides.
Limits
Invalid input appears in the status line. IEEE floating point applies unless a row says otherwise. CZNull does not receive the numbers.