# Sine Function Plot π (pi)

This figure illustrates the graph of sine function from to radians. Geometrically, the sine of an angle is equal to the component of the point formed by the angle on the unit circle. This figure also shows the numeric values of radian angles on the top edge of the plot grid. See also, the related figures:

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The sine function returns the sine of a number provided in radians. In geometric terms, the function returns the vertical component of the point formed by the angle on the unit circle.

Radians are a unit that measure angle using the radius of a circle. One radian is equal to the amount of rotation required to travel the length of one radius along the circumference of the circle.

The unit circle is a circle of radius one placed at the origin of the coordinate system. This article discusses how the unit circle represents the output of the trigonometric functions for all real numbers.

Plot of Sine Function from 0 to τ (tau) radians.

Plot of Sine Function from 0 to 360 degrees