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60derajat = 1/6 lingkaran kan (1lingkaran 360 derajat)
Dan luas juring (1/6 lingkarannya) 18,84
Kita masukin itung itungannya
1/6 x pi x r^2 =18,84
r^2=18,84 x 6 : 3,14
r^2=36
r=6
semoga membantu................................................