Volume is the measure of the inside of a 3-D figure.
The amount of 3-dimensional space an object occupies. Capacity.
For this example the volume is 200 units3
Units of volume include:
Metric: cubic centimeters (cm3), cubic meters (m3)
The total area of the surface of a three-dimensional object.
Example: the surface area of a cube is the area of all 6 faces added together.
The formula is S = Ph + 2B
Metric: cubic centimeters (cm2), cubic meters (m2),
Practice Surface Area here.