Unit Circle Calculator


About Unit Circle Calculator (Formula)

A unit circle calculator is a tool used in trigonometry to perform calculations related to angles and coordinates on the unit circle, which is a circle with a radius of 1 unit. This calculator helps in understanding the relationships between angles, coordinates, and trigonometric functions such as sine, cosine, and tangent.

The formula for the unit circle is derived from the Pythagorean theorem, and it allows you to find the coordinates of points on the unit circle corresponding to a given angle θ:

x = cos(θ) y = sin(θ)


  • x: The x-coordinate of the point on the unit circle.
  • y: The y-coordinate of the point on the unit circle.
  • θ: The angle in radians.

This formula is fundamental because it relates the geometric properties of the unit circle to the trigonometric functions, enabling you to compute values of sine and cosine for any angle on the unit circle. It’s particularly useful for calculating values of these trigonometric functions at common angles like 0°, 30°, 45°, 60°, and 90°.

For example, to find the coordinates of a point on the unit circle corresponding to an angle of 45°, you would use the formula:

x = cos(45°) y = sin(45°)

These values would be approximately: x ≈ 0.7071 y ≈ 0.7071

In addition to calculating coordinates, the unit circle calculator can assist in finding trigonometric function values, determining angle measures, and converting between degrees and radians.

Overall, the unit circle calculator and its underlying formula are powerful tools for solving a wide range of trigonometric problems, from basic angle calculations to more complex applications in mathematics, physics, and engineering.

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