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H=7cm
V=πr²H/3
V=6²*7π/3 =36*7π/3 =12*7π
V=84π cm³
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l²=H²+r²
l²=7²+6²=49=36=85
l=√85
Pc=πr(r+l)
Pc=6π(6+√85)cm²