Triangle Solver
Solve any triangle from SSS, SAS, ASA, AAS, or SSA.
Side a
3.000
Side b
4.000
Side c
5.000
Angle A
36.87°
Angle B
53.13°
Angle C
90.00°
Area: 6.000 square units
Perimeter: 12.000
Solves any triangle given enough info: SSS uses Law of Cosines, SAS combines Law of Cosines + Sines, ASA/AAS use Law of Sines. SSA is the ambiguous case - sometimes two valid triangles exist.
About
Pick which 3 elements you know (sides and/or angles). The tool applies Law of Cosines or Law of Sines as appropriate, fills in the missing pieces, and reports area and perimeter.
How to use
- Pick what you know (SSS, SAS, etc.).
- Fill in the values.
FAQ
Why does SSA sometimes have two answers?+
The ambiguous case. With two sides and a non-included angle, there can be 0, 1, or 2 valid triangles depending on the geometry. The tool returns the obtuse-angle version.