Solve any triangle from three known parts — sides, angles, or both. Works out the missing sides and angles, area, perimeter, in-circle and circum-circle, shows the law-of-sines or law-of-cosines steps, and draws the triangle to scale. Handles the ambiguous SSA case.
Angle A sits opposite side a, B opposite b, C opposite c — and A + B + C always sums to 180°. Pick what you know, fill those three boxes, press Solve.
The solved triangle
How it was solved
Angles use degrees. The ambiguous SSA case (two sides and an angle opposite one of them) can have zero, one or two valid triangles — this solver checks for all of them instead of silently picking one.