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v=120πcm³
⅓πr²h=120π/:π
⅓r²×10=120
r²=120:10/3
r²=36
r=√36
r=6cm=promień podstawy
b]l=tworząca
l²=10²+6²
l²=100+36
l=√136
l=2√34cm(= około 11,66cm)