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=πr(r+2t)
= 22/7. 10,5 (10,5+2. 20)
=33(50,5)
=1666,5 cm²
phi.r.r + 2 phi.r.t
3,14.10,5.10,5 + 2. 3,14.10,5.20
346,185 + 1318,8
1664,985
1665 cm2