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Verified answer
8.L = πr²
L = 3,14 . 40 . 40
L = 3,14 x 1.600
L = 5.024 cm²
9.
L = πr²
L = 3,14 . 46 . 46
L = 3,14 x 2.116
L = 6.644,24 cm²