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The unit circle is one of the tools in trigonometry. It is a circle with a radius of 1 centered at the origin (0,0) of a coordinate plane. Because the radius (r) is 1, the coordinates of any point (x, y) on the edge of the circle directly tell you the cosine and sine of the angle θ:
x = cos(θ)
y = sin(θ)
Unit Circle Quiz/Game
This Unit Circle Master game is a high-speed educational tool designed to help you memorize the unit circle. It tests your ability to quickly identify the exact values of trigonometric functions (sine, cosine, and tangent) for special angles for the four quadrants. Scroll down the page for a more detailed explanation.
Have a look at the following lesson on various tricks to remember the unit circle.
How to remember the unit circle?
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