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h=wysokosc
h=3r
2r×3r=54cm²
6r²=54
r²=54:6
r²=9
r=3cm
h=3r=9cm
pole podstawy=πr²=π×3²=9πcm²
pole boczne=2πrh=2π×3×9=54π
pole całe=2×9π+54π=72πcm²
v=9π×9=81πcm³