Unit Circle 
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The unit circle tool lets you draw unit circles showing the sine, cosine, tangent and cotangent ratios.
Drawing a unit circle is identical to drawing a centre/radius circle.
Unit circle properties allow you to turn each ratio on or off  as well as defining how each ratio line is shown.
You can change the angle by moving the control points at each end of the angle or by explicitly entering the angle in the screen above.
Important Points
Keyboard Commands
For demonstration purposes, the unit circle's angle can be controlled using the keyboard.
Home Resets the angle to 0°. Up Arrow Increases angle by 1°. Down Arrow Decreases angle by 1°. Page Up Increase angle by 5°. Page Down Decreases angle by 5°.
Available Parameters for Unit Circles
$angle Angle expressed as the current angle type (degrees or radians) $degrees Angle in degrees $radians Angle in radians. Angle will be show as a multiple of pi if possible. $sin $cos $tan $cot
