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H=75/9
H=²⁵/₃=8,33
r²+H²=l²
75²+(²⁵/₃)²=l²
5625+625/9=l²
l²=50625/9+625/9
l²=51250/9
l=√51250/3
l=√625*82/3
l=25√82/3
Pb=Πrl
Pb=Π*75*25√82/3
Pb=625√82Πcm²
Pb=625*9,1*3,14≈17859cm²