Unit Circle Labeled With Quadrantal Values

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Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane. At each quadrantal angle, the coordinates are given, but not the angle measure. These coordinates can be used to find the six trigonometric values/ratios. The x-coordinate is the value of cosine at the given angle and the y-coordinate is the value of sine. From those ratios, the other 4 trigonometric values can be calculated.

Galleries

Unit Circles

Source

Florida Center for Instructional Technology Clipart ETC (Tampa: University of South Florida, 2007)

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