Triangle
Calculator

Solve any triangle from three known values using Law of Cosines and Law of Sines. Get all sides, angles, area, perimeter, and properties.

Sides

Angles (degrees)

Enter 3 known values (sides and/or angles) and click Solve.

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How do the Law of Sines and Cosines solve any triangle?

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Frequently Asked Questions

The most common formula is one half times base times height. When only the three side lengths are known, Heron formula can be used: area equals the square root of s times (s minus a) times (s minus b) times (s minus c), where s is the semi-perimeter.

The Pythagorean theorem states that in a right triangle, the square of the hypotenuse (longest side) equals the sum of the squares of the other two sides. Written as a squared plus b squared equals c squared.

An acute triangle has all angles less than 90 degrees, a right triangle has exactly one 90-degree angle, and an obtuse triangle has one angle greater than 90 degrees. The sum of all interior angles in any triangle is always 180 degrees.

Triangle Calculator - Solve Any Triangle | ToolsCanvas