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volume 1 = 4πr³ = 4 . 3,14 . 12³
= 4 . 3,14 . 1728
= 4 . 5425,92
= 21703,68 cm³ ≈ 21704 cm³
volume 2 = 4πr³ = 4 . 3,14 . 20³
= 4 . 3,14 . 8000
= 4 . 25120
= 100480 cm³
volume 1 : volume 2 = 21704 : 100480
= 2713 : 12560