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r²=49
r=7
l=2r=14
h=√[l²-r²]=√[14²-7²] = √147 = 7√3
Pb=πr×l= 7π×14 = 98π cm²
V = 1/3πr²×h = 1/3×49π×7√3 = 343√3/3 cm³