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lp. bola: 3πr²
942 = 3 x 3,14 x r²
942 = 6,28 x r²
942 : 9,42 = r²
100 = r²
10 = r
v. bola: 4/3πr³
: 4/3 x 3,14 x 10 x 10 x 10
: 4186, 67 cm³