Fill any 3 of the 6 fields, including at least one side. The case (SSS, SAS, ASA, AAS or SSA) is detected automatically; when SSA gives two possible triangles, both are shown.
Solve any triangle: enter any three sides or angles (at least one side) and get every side, angle, area, perimeter, heights, medians, inradius and circumradius — with a labelled diagram drawn to scale, worked steps and a degrees/radians toggle.
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Solve any triangle: enter any three sides or angles (at least one side) and get every side, angle, area, perimeter, heights, medians, inradius and circumradius — with a labelled diagram drawn to scale, worked steps and a degrees/radians toggle.
📖 From the blog: How to calculate triangle sides and angles, step by step
Sides 3, 4, 5 give area 6 square units, perimeter 12 units and angles of about 36.87°, 53.13° and 90°. Entering angle A = 30° with sides a = 5 and b = 8 instead shows both SSA solutions, because two different triangles fit those values.
Fill any 3 of the 6 fields, including at least one side. The case (SSS, SAS, ASA, AAS or SSA) is detected automatically; when SSA gives two possible triangles, both are shown.
It is a visual aid, not a replacement for the numeric output. Some charts compare values with different units, and those magnitudes are not directly comparable.
Check units, signs, assumptions and rounding first. The tool cannot know whether the values you enter describe the real situation correctly.
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