What Is the Unit Circle?
The unit circle is a circle centered at the origin (0,0) with a radius of exactly 1 unit (r = 1). Every point (x, y) on the unit circle corresponds to (cos θ, sin θ).
Trigonometry 9 min read
Unit Circle Explained: Chart, Radians & Exact Trig Values
Master the unit circle in trigonometry. Learn radian-to-degree angles, (cos θ, sin θ) coordinate points, and all four quadrant signs.
Published August 11, 2026
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Updated: August 11, 2026
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