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r= 10cm
s = 26cm
dit : a.Ls
b. Lp
a. Ls =πrs
Ls = 3,14×`10×26
Ls = 816,4 cm²
b. Lp = πr²+Ls
Lp = 3,14×10²+816,4
Lp = 314 + 816,4
Lp= 1130,4cm