## Law of Cosines Calculator

Uses the law of cosines to calculate unknown angles or sides of a triangle. In order to calculate the unknown values you must enter 3 known values. To calculate any angle, A, B or C, enter 3 side lengths a, b and c. This is the same calculation as Side-Side-Side (SSS) Theorem. To calculate side a for example, enter the opp See more

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c² = a² + b² - 2ab * cos (γ) For a right triangle, the angle gamma, which is the angle between legs a and b, is equal to 90°. The cosine of 90° = 0

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## Law of Cosines Calculator

The Law of Cosines is a generalization of the Pythagoras theorem, which holds only for right-angled triangles. If the angle C is 90⁰, then cos C=0. Then the Law of Cosines reduces to \$\$c^2=a^2 + b^2 \$\$ Properties of a triangle Given below

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## Solving for a side with the law of cosines

These calculations can be either made by hand or by using this law of cosines calculator. A = cos-1 [(b 2 +c 2-a 2)/2bc] Considering that a, b and c are the 3

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