Need help with code snippet using trig.

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sswift

And trigonometry deals with triangles. And how do you draw a circle on a computer screen? By calculating lots and lots of triangles. One for each pixel in fact.

Each pixel in a circle is one point of a right triangle, where the point's radius is the length of the hypoteneuse, the point's X coordinate is the length of the opposite side, and the point's Y coordinate is the length of the adjacent side.

Trigonometry! Ta da!