Learning Mission

Interactive Triangle Calculator

Enter three known values to solve a triangle, inspect a proportional diagram, and follow the calculation method.

Side a is opposite angle A, side b is opposite angle B, and side c is opposite angle C.

Enter exactly three known values

3
Include at least one side. Leave the other three boxes empty. Angles must be greater than 0 degrees and less than 180 degrees.

Quick examples

Pair A

Side a is opposite angle A

Pair B

Side b is opposite angle B

Pair C

Side c is opposite angle C

0 of 3 values entered

Your triangle will appear hereEnter three known values or choose a quick example.

Matching letters show opposite pairs: a with A, b with B, and c with C.

Triangle results

Waiting for input
Sidesa, b, c
AnglesA, B, C
Perimeter-
Area-
Angle sum180 degrees

These SSA inputs create two valid triangles. Use the buttons above the diagram to compare both solutions.

Show solution steps

Solve a triangle to see the method and calculations.