Calculadora de Cosseno
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
cos(θ) — com θ em graus
About this calculator
The Cosine Calculator is a practical tool for students, engineers, and professionals who need to quickly calculate the cosine of an angle in degrees. It eliminates the need to consult trigonometric tables or use complex scientific calculators, providing results instantly and accurately.
Its operation is simple: you enter the angle value in degrees, and the calculator applies the cosine function, internally converting the angle to radians (multiplying by π/180) before computing. The result is a number between -1 and 1, representing the ratio of the adjacent side to the hypotenuse in a right triangle.
Use this calculator in situations such as solving geometry problems, physics (calculating force components), civil engineering (calculating slopes), or graphic programming (object rotation). It is useful whenever you need the cosine of an angle in degrees without worrying about conversions.
Common precautions: ensure the angle is in degrees, not radians. For very large angles, the cosine may be approximate due to numerical precision limitations. Remember that cos(90°) = 0 and cos(0°) = 1 are exact values.
Frequently asked questions
What is the difference between cosine of degrees and radians?
The calculator expects angles in degrees. If you input radians, the result will be wrong. To convert, multiply radians by 180/π.
Can I calculate the cosine of negative angles?
Yes, the cosine function is even, so cos(-θ) = cos(θ). Just enter the negative value in degrees.
Is the result always between -1 and 1?
Yes, the cosine of any real angle is always in the range [-1, 1].
What is cosine used for in everyday life?
It is used in navigation, civil engineering, computer graphics, and physics to calculate directions, forces, and projections.
How accurate is the calculation?
The calculator uses double-precision floating point, ensuring about 15 decimal digits for most angles.