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2r=9 to r=9/2
V=1/3πr²·h=1/3π·(9/2)²·13=1/3·π·81/4·13=1053π/12=87,75π [j³]
r²+h²=l²
(9/2)²+13²=l²
81/4+169=l²
20,25+169=l²
l=√(189,25)=√(757/4)=√757/2
Pc=πr²+πrl=π·(9/2)²+π·9/2·√757/2=81/4π+9√757/4π=9π(9+√757)/4 [j²]