C = 2πr
30 = 2πr
πr = 15
OBS.: π ≈ 3,14
r = 15 ÷ 3,14
r = 4,78 cm
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C = 2πr
30 = 2πr
πr = 15
OBS.: π ≈ 3,14
r = 15 ÷ 3,14
r = 4,78 cm