Geometry & Shape Calculators >
Triangle Calculator
Calculate area, perimeter, and angles of a triangle.
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- Inputs: Enter what you know (e.g., 3 sides, or 2 sides + 1 angle).
- Calculate: The tool solves the entire triangle.
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.