Play with the interactive Unit Circle below. See how different angles (in radians or degrees) affect sine, cosine and tangent: Can you find an angle where sine and cosine are equal? The "sides" …

Frequently, especially in trigonometry, the unit circle is the circle of radius 1 centered at the origin (0, 0) in the Cartesian coordinate system in the Euclidean plane.

Aug 21, 2025 · Master the unit circle with this comprehensive guide! Learn angles, radians, coordinates, and trigonometric functions with ease.

Learn how to use the unit circle to define sine, cosine, and tangent for all real numbers. Created by Sal Khan.

Nov 28, 2025 · A unit circle is a circle that has a radius of one unit with its center at the origin. Learn and master this crucial element of trigonometry with examples here!

Learn the unit circle with a labeled diagram, and practice problems in both radians and degrees. Perfect for test prep and review.

Using coterminal angles and the unit circle to determine exact values of trigonometric functions at negative angles and angles greater than 360 degrees (or 2 pi)

The unit circle helps visualise key concepts such as periodicity, symmetry, and angle relationships in both degree s and radians, forming a foundation for solving trigonometric equations and …

This new definition of TRIGONOMETRIC FUNCTIONS defined on an unit circle is an extension to the old definition of TRIGONOMETRIC RATIOS defined on a right-angled triangle.

Learn the equation of a unit circle, and know how to use the unit circle to find the values of various trigonometric ratios such as sine, cosine, tangent. Also check out the examples, FAQs.