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4186,67 = 4/3 . 3,14 . r³
r³ = (4186,67 . 3) : (4 . 3,14)
r³ = 12560,01 : 12,56
r = ³√1000 = 10cm
Lp = 4 . 3,14 . 10²
= 1256 cm²