### Home > A2C > Chapter Ch4 > Lesson 4.2.1 > Problem 4-77

4-77.

Substitute 1 for *r* in the sphere and cylinder equations.

Now add the values together.

*V* = 4π

Remember that the radius is being cubed.

The radius will not double because of the r, r^{2}, r^{3} relationship.

Now, see part (a).

The tank will be 83.776m^{3}.

Remember that the total is the combination of a sphere and a cylinder.