The volume of a cylindrical water tank is $1.078\times {10}^6$ litres. If the diameter of the tank is $7 \mathrm{m}$, find its height.

For the cylinders $A$ and $B$.

Find out the cylinder whose volume is greater.

For the cylinders $A$ and $B$.

Verify whether the cylinder with greater volume has greater total surface area.

For the cylinders $A$ and $B$.

Find the ratios of the volumes of the cylinders $A$ and $B$.