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La = = = 616 cm²
b)
Lp = 2 . La + Ls
1760= 2(616) + Ls
1760= 1232 + Ls
Ls = 1760 - 1232 = 528 cm²
a)
Ls = 2 r t
528 = 2 . . 14 . t
528 = 176 t
t = 528 / 176 = 3 cm