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360 derajat = x cm
60x = 360 * 22
60x = 7920
x = 7920 / 60
x = 132
keliling lingkaran = 2πr
2πr = 132
πr = 132/2
πr = 66
r = 66 / π
r = 66 / (22/7)
r = 21 cm