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r=3.5 cm
t=12cm
Ls=...?
s²=r²+t²
s²=3.5²+12²
s=√12.25+144
s=√156.25
s=12.5cm
Ls=La+L.selimut
Ls=πr²+πrs
Ls=3.14×3.5²+3.14×3.5×12.5
Ls=38.465+137.375
Ls=175.84cm²