Visual trigonometry and triangle calculator
Solve triangles from sides and angles with the laws of sines/cosines, Pythagoras and ambiguous SSA cases. Visualize the triangle and convert degrees/radians.
Solve triangles without choosing in advance between the Pythagorean theorem, the law of sines or the law of cosines. General mode automatically detects SSS, SAS, ASA/AAS or SSA and keeps every valid solution. Each solution includes derived measurements and a proportional SVG drawing.
Input data
Result and visualization
Enter the values and press “Solve / check” to draw the proportional triangle.
What the calculator solves
In general-triangle mode, enter three independent values with at least one side. The calculator determines whether the case is SSS, SAS, ASA/AAS or SSA. An ambiguous SSA case is never discarded: if two mathematically valid triangles exist, both are shown.
Right-triangle mode uses the Pythagorean theorem and trigonometric ratios with a fixed convention: c is the hypotenuse and C = 90°. Angle mode converts degrees and radians, normalizes full turns, and calculates sine, cosine and tangent.
Available results
- All solved sides and angles without intermediate rounding.
- Area, perimeter, semiperimeter, heights, inradius and circumradius.
- Proportional SVG with side/angle labels and a right-angle marker when applicable.
- sin/cos/tan ratios for A, B and C, including undefined-tangent handling.
- A selector for both solutions when the ambiguous SSA case occurs.
- Copyable summary/table, CSV with one or two solutions, and printing of the current result.
Improve this calculator
Found an error or missing a feature?
Send us the example so we can review this calculator and turn real cases into improvements or automated tests.
