Geometry Tool
Solve almost any triangle from three known values.
Enter any three known values with at least one side. This solver handles SSS, SAS, ASA, AAS, and the tricky SSA case where two valid triangles may exist.
Accepted input sets
Three values total. At least one side is required. Angles must sum to less than 180° before solving.
What you get back
All side lengths, all angles, perimeter, area, height to side c, and a live triangle sketch.
Known Values
Leave unknown fields blank. Side lengths can use any unit as long as all sides use the same one.
Quick Examples
Results
Ready. Enter exactly three known values, with at least one side, then click Solve Triangle.
Triangle notation uses standard convention: side a is opposite angle A, side b is opposite B, and side c is opposite C.