The Town of Darlington Plans to Build a Spherical Water $30.00 \mathrm{~m}$

Essay

The town of Darlington plans to build a spherical water tower with an inner diameter of $30.00 \mathrm{~m}$ and sides of thickness $5.00 \mathrm{~cm}$ . Find the approximate volume of steel needed using differentials. If the density of steel is $7800 \mathrm{~kg} / \mathrm{m}^{3}$ , find the approximate amount of steel needed.