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30 = 2 × 3,14 × r
30 = 6,28 r
r = 30/6,28
r = 4,77 cm
Setelah diperbesar :
r = 4,77 × 2
r = 9,54
K = 2 × 3,14 × 9,54
= 59,9112 cm
MA'AF KLO SALAH!!!