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= 1/2 x 22/7 x 7²
= 77 cm²
L2 = p x l
= 14 x 12
= 168 cm²
L3 = a x t
= 14 x 10
= 140
Ls = 140 + 77 + 168 /6
= 385/6
= 64,2 ons
24. 90 - 74 = 16