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= 62,8 x 220
= 13.816 cm2
b.) Ls = 2 x 31,4 x 20 x 100
= 628 x 20
= 12.560 cm2
La = 3,14 x 20 x 20
= 1.256 cm2
Ls - La
= 12.560 - 1.256
= 11.304 cm2