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48=½ah
48=½a×8
a=48:4
a=12cm=średnica podstawy
r=6cm
l=√6²+8²=√100=10cm
pole podstawy=πr²=π×6²=36π
pole boczne=πrl=π×6×10=60π
pole całkowite=36π+60π=96πcm²
v=⅓×36π×8=96πcm³