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L = π . r²
L = 22/7 . 14.14
L = 22 .7 .14
L = 2016


L = ¼ .π . d²
L = ¼ .22/7 .21 .21
L = ¼ . 22 . 3 .21
L = 346,5

L= π .r²
L = 3,14 . 35 .35
L = 3846,5

L = π . r²
L = 3,14.65.65
L = 13266,5

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