Law of Cosines Calculator
Our Law of Cosines Calculator helps you solve triangles using the Law of Cosines in seconds. With our calculator, you can easily enter the values of the sides and angles of a triangle and our calculator will do the rest. It's perfect for students studying trigonometry and solid geometry and can be used to solve problems in a matter of seconds. Calculate angles or sides of triangles with the Law of Cosines.
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Law of Cosines Calculator Details
Law of Cosines
The law of cosines relates the lengths of the sides of a triangle to the cosine of one of its angles.
For a triangle with sides a, b, and c opposite respective angles A, B, and C, the law of cosines states:
- a2 = b2 + c2 – 2bc cos A
- b2 = a2 + c2 – 2ac cos B
- c2 = a2 + b2 – 2ab cos C
Pythagorean theorem is a special case of law of cosines where the C is 90 degree there cos 90 = 0 and the law of cosines reduces to
- c2 = a2 + b2