Enter your known values and click “Solve triangle” to see the computed sides, angles, area, and radii here.
FAQ
Which input combinations are supported?
You can pick SSS, SAS, or ASA. Ambiguous SSA cases are intentionally excluded to keep the output deterministic.
How do you compute the area and radii?
Once all three sides are known, the solver uses Heron’s formula for the area, then derives the circumradius with R = abc / (4S) and the inradius with r = S / s.
Do you validate impossible triangles?
Yes. The calculator checks the triangle inequality and the 180° interior-angle sum before showing any results.