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1808,64 = 4 . 3,14 . r²
r² = 1808,64 ÷ 12,56
r = √ 144 = 12 cm
vol = 4/3 . 3,14 . 12³
= 7234,56 cm³
2) vol = 1437 ⅓ cm³
1437⅓= 4/3 . 3,14 . r³
r³ = 1437 ⅓ : 4,19
r = ³√ 343 = 7
d = 7 x 2 = 14cm
3) vol = 904,32 cm³
904,32 = 4/3 . 3,14 . r³
r³ = 904,32 : 4,19
r = ³√ 216 = 6 cm
L = 4 . 3,14 . 6²
= 452,16 cm²