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113.04 = 3,14 x r²
r² = 113.04/3.14
r² = 36
r = √36
r = 6
s = √t² + r²
s = √8² + 6²
s = √64 + 36
s = √100
s = 10
Ls = πrs
Ls = 3,14 x 6 x 10
Ls = 188.4 cm²