Geometry & Shape Calculators >
Triangle Calculator
Calculate area, perimeter, and angles of a triangle.
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How to use Triangle Calculator
- Inputs: Enter what you know (e.g., 3 sides, or 2 sides + 1 angle).
- Calculate: The tool solves the entire triangle.
About Triangle Calculator
The Triangle Calculator solves for unknown sides, angles, area, and perimeter. It handles Right Triangles (Pythagoras) and Oblique Triangles (Law of Sines/Cosines).
Uses Heron's Formula to find area when only 3 sides are known.
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