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średnica=6cm
r=3cm=0,3dm
0,27=πr²h
0,27=3×0,3²h
h=0,27:0,27
h=1dm
pole=2πr²+2πrh=2×3×0,3²+2×3×0,3×1=
0,54+1,8=2,34dm² potrzeba+20%=2,34+0,2×2,34=2,808dm²