About this tool: Triangle Solver
Solve a triangle from three sides: area, perimeter and all three angles.
Use the same length unit for all three sides. A valid triangle requires every side to be shorter than the sum of the other two. The calculator uses a stable area formula and the cosine rule; area is in squared input units and all angles are in degrees.
How the calculation works
Worked example
| a | 3 |
| b | 4 |
| c | 5 |
S = 6; P = 12; A ≈ 36.87°; B ≈ 53.13°; C = 90°
Questions and answers
What does this tool do?
Solve a triangle from three sides: area, perimeter and all three angles. Use the same length unit for all three sides. A valid triangle requires every side to be shorter than the sum of the other two. The calculator uses a stable area formula and the cosine rule; area is in squared input units and all angles are in degrees.
What affects precision and input format?
Floating-point results are rounded for display. Keep the units shown in the input labels; decimal points and decimal commas are accepted.
Where are the calculations performed?
The calculation runs in your browser. You can use the tool without installing software.
Asted Cloud
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