Triangle Sides Calculator
Triangle Sides Calculator: calculate sss: heron area with consistent units and explicit assumptions.
Inputs
mm
mm
mm
Results
- Side a
- 3 mm
- Side b
- 4 mm
- Side c
- 5 mm
- Angle A
- 36.869898 °
- Angle B
- 53.130102 °
- Angle C
- 90 °
- Area
- 6 mm²
- Perimeter
- 12 mm
Formula
SSS: Heron area = √[s(s−a)(s−b)(s−c)]
SAS: c² = a² + b² − 2ab cos(C)
ASA: a/sin(A) = b/sin(B) = c/sin(C)
Assumptions & limits
- Ideal geometry; use consistent units. Results exclude tolerances, deformation and internal fittings.
Worked example
For the example inputs: Side a = 3 mm; Side b = 4 mm; Side c = 5 mm.
SSS: Heron area = √[s(s−a)(s−b)(s−c)]