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62,8 = 2. 3,14 . r
62,8 = 6,28 . r
r = 62,8/6,28
r = 10
V = 1/3 . r2 . t
V = 1/3 . 3,14 . 10 . 10 . 15
V = 1/3. 314 . 15
V = 1570 cm3