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Lp = πr(r + 2t) + 2.π.r²)
Lp = πr (r + 2t + 2r)
Lp = π.r (3r + 2t)
Lp = 3,14 .10 (3. 10 + 2. 25)
Lp = 31,4 ( 80)
Lp = 2512 cm²