Math & Statistics · Tool #25
Triangle Calculator
Calculate triangle sides, angles, area and perimeter.
Triangle Inputs
Choose a known-data method to solve a triangle.
Angles are in degrees. SSS uses the law of cosines; SAS and ASA use the law of sines/cosines as appropriate.
Triangle Result
Solved sides, angles, area and perimeter.
Triangle
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Sides a, b, c
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Angles A, B, C
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Area
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Perimeter
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How to use this calculator
What to enter
Enter or select the following as requested: Method. Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
The result is the geometric quantity derived from the triangle dimensions, side lengths, angles, or relationship requested by this tool. Check whether angles are in degrees or radians and whether the given measurements satisfy the stated triangle conditions.
When to use it
Use this to solve a triangle or verify a geometric relationship. Keep units consistent and check the diagram and assumptions shown by the calculator.