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154 = 4 . 22/7 . r²
154 = 88/7 . r²
154 . 7/88 = r²
12,25 = r²
3,5 cm = r
V = 4/3πr³
= 4/3 . 22/7 . 3,5 . 3,5 . 3,5
= 4/3 . 22/7 . 35/10 . 35/10 . 35/10
= 4/3 . 22/7 . 7/2 . 7/2 . 7/2
= 4/3 . 11 . 49/4
= 1/3 . 11 . 49
= 539 / 3
V = 179,7 cm³
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