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54cm²=6r²
9cm²=r²
3cm=r
Pc=2πr(r+H)
Pc=2π*3cm(3cm+3*3cm)
Pc=6πcm(3cm+9cm)
Pc=18πcm²+54πcm²
Pc=18π(1+3)cm²
V=πr²*H
V=π*(3cm)²*9cm
V=9πcm²*9cm
V=81πcm³