Sine, Cosine and Tangent of an Angle

This app shows the geometric definition of the sine, cosine and tangent values of an angle. Using the radio buttons, you can select one of these three trigonometric functions. On the left side (unit circle), the preset angle can be modified by dragging the mouse. On the right, the graph of the considered trigonometric function is drawn. The lines and arcs marked in the same color are of equal length.

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