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πr²=81π cm²
r=9
Ppb=πrl
Ppb=162π cm²
πrl=162π
9l=162 /9
l=18
H²+9²=18²
H²=324-81
H²=243
H=√243=9√3
O= πr² × H
O= π81 × 9√3
O=27π×9√3
O=9(3π×√3)