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luas bola = 4*3,14*r*r
616=12,56 *
r2=616/12,56 = 49
vol bola :
616 = 4. 3,14. r²
r² = 616 / 4 . 3,14
r² = 616 / 12,56
r² = 49,044
r = 7,00318
r = 7 cm
V = bola
= 4/3 . 22/7 . 7 . 7
= 1936 / 21
= 92,190 m ²