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360 derajat itu sama dengan 2π radian :
jadi, ...
*) 20 derajat = (20/360) x 2π = π/9 radian
**) 50 derajat = (50/360) x 2π = 5π/18 radian
***) 100 derajat = (100/360) x 2π = 5π/9 radian