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Trigonometry
Law of Cosines Calculator
Finds the third side of a triangle when two sides and the included angle are known, using c = √(a² + b² − 2ab·cos(C)). Essential for solving oblique (non-right) triangles in surveying, navigation, structural engineering, and computer graphics.
Fill in the required fields to see your result.
Trigonometry
Law of Cosines Calculator
Calculate the unknown side of any triangle when two sides and the included angle are known, using the Law of Cosines. Essential for navigation, land surveying, and geometry problems.
Fill in the required fields to see your result.
Key differences
| Law of Cosines Calculator | Law of Cosines Calculator | |
|---|---|---|
| Category | Trigonometry | Trigonometry |
| Inputs required | 3 | 4 |
| Result | Side C (units) | Side C Length (units) |
| What it does | Finds the third side of a triangle when two sides and the included angle are known, using c = √(a² + b² − 2ab·cos(C)). Essential for solving oblique (non-right) triangles in surveying, navigation, structural engineering, and computer graphics. | Calculate the unknown side of any triangle when two sides and the included angle are known, using the Law of Cosines. Essential for navigation, land surveying, and geometry problems. |