Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Trigonometry
Cosine Calculator
Calculates the cosine of an angle entered in degrees, returning a value between −1 and 1. Use it when resolving horizontal force components, applying the Law of Cosines, computing dot products, or working with periodic functions.
Fill in the required fields to see your result.
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.
Key differences
| Cosine Calculator | Law of Cosines Calculator | |
|---|---|---|
| Category | Trigonometry | Trigonometry |
| Inputs required | 1 | 3 |
| Result | Cosine value | Side C (units) |
| What it does | Calculates the cosine of an angle entered in degrees, returning a value between −1 and 1. Use it when resolving horizontal force components, applying the Law of Cosines, computing dot products, or working with periodic functions. | 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. |