Trigonometry Circle
Unit circle with angle θ: read sin θ, cos θ, and tan θ as coordinates and ratios. Links rotation to trigonometric functions used in waves and E&M phasors.
Who it's for: Precalculus and intro physics math support.
Key terms
- unit circle
- sine
- cosine
- tangent
- radians
How it works
On the unit circle, cos θ is the x-coordinate and sin θ is the y-coordinate of the point at angle θ from the positive x-axis. The diagram shows a circle of radius R in pixels; ratios match the unit circle.
Key equations
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