Determines if coordinates for a unit circle are valid, or calculates a variable for unit circle coordinates

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- area
- Number of square units covering the shape
- circle
- the set of all points in the plane that are a fixed distance from a fixed point
- equation
- a statement declaring two mathematical expressions are equal
- origin
- On a two digit coordinate plane, the point (0, 0), where the x-axis and y-axis cross.
- point
- an exact location in the space, and has no length, width, or thickness
- radius
- Distance from the center of a circle to the edge

C/2π - unit circle
- A circle centered at the origin (0, 0) with a radius of 1

x^{2}+ y2 = 1