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B. 3,14 X 15 X 15 = 706,5 CM2
C. 3,14 X22 X22 = 1519,76 CM2
D. 3,14 X 40 X 40 = 5024 CM2
r = 8 cm
L = 3,14 . 8 . 8
= 200,96
b. L = 3,14 . 15.15
= 706,5
c. L= 3,14 . 22 .22
= 1.519,76
d. L= 3,14 . 40 . 40
= 5.024