V = r²h where,
V is the volume of the cylinder
r is the radius of the cylinder
h is the height of the cylinder
in this case, h is the value we want to find, h, r is 3m and V is 155.43m³ !!
155.43 = × (3)² × h
17.27 = × h
h = 5.4972117...
= 5.50m (3.s.f) = height of cylinder
hope this helped, if you have any questions feel free to ask !! :D