- Unit Circle
A unit circle is a circle with a radius equal to one (1) unit. The circle is portioned into sectors based on the special right triangles 30-60-90 and 45-45-90. These are the grey lines within the circle. To see the Degree measures check the Degrees check box. Select each check box separately to see and learn the values described.
Radians measure is determined by the number of radii that lie on the circumference of the circle The coordinates are the cosine and sine of the angles formed.