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s = rΘ
radian formula
0, 90, 180, 270, 360
0, π/2, π, 2π, 3π/2
30, 150, 210, 330
π/6, 5π/6, 7π/6, 11π/6
45, 135, 225, 315
π/4, 3π/4, 5π/4, 7π/4
60, 120, 240, 300
π/4, 2π/3, 4π/3, 5π/3