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3000=3,14 * r^2 *0,2m
r^2= 3000/3,14*0,2
r^2= 3000/0,628
r^2= 4777,07
r= 69,12 m
h=2dm
V=πr^2 h
r^2=V/πh
r=√(V/πh)
r=√(3000m3/(3,14*0,2m))=√(3000m3/0,628m)=√(4777,07m^2 )=69,12m