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4.400 = 22/7 . r² . 14
4.400 = 44 . r²
r² = 4.400 / 44
r² = 100
r = √100
r = 10 cm
L = 2 . π . r (r + t)
L = 2 . 3,14 . 10 (10 + 14)
L = 2 . 3,14 . 10 . 24
L = 1.506 ,2 cm²