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radian = degrees
Memory recall : 2π radian = 360 °
1 radian = 360 ° / 2π
1 radian = 360 ° / 6.2832
1 radian = 57.296 °
2π = 2 * 3.1416 = 6.2832
π /2 =1.5708 rad = 90 °
π /2.4 = 1.309 rad = 75 °
π /3 =1.0472 rad = 60 °
π /4 = 0.7854 rad = 45 °
π/6 =0.5236 rad = 30°
π/8 = 0.3927 rad = 22.5 °