That's why our houses are part of simple shapes like squares. Even the columns/pillars are like a finite cylinder.
Now we are able to calculate it with a simple doble or maybe triple integral if necessary.
Also, in order to calculate the volume of some functions where "ROU" remains the same regarding the z axis, we also can create two planes( z=4. =0) in order to calculate the volume under the curve.
The possibility to be able to calculate the surface or area of a non flat shape is amazing to me. Because we can solve it trough a doble integral and with a simple procedure, thanks to the revisor coeficient.
Moreover, if you look further, even the lamp's shape can be inferred like a finit cone. That's wonderful.
In conclusion, when we talk about Calculus we are talking about a useful tool to explain our world.
