π is 3,14159… (not 3 and a half).

2π is a full revolution in radians.

Cosine gives you the x-coordinate of a vector with length 1 and the given angle in radians with the x-axis. Sine gives you the y-coordinate of the same vector.

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Principal Engineer @ Farfetch - Future Retail Lab https://about.me/antao.almada

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