This paper discusses the mathematical modeling of 3-Dimensional objects. Ananalytical description of a 3D object (in this case, a pear) is modeled in a suitable way. We will be comparing the volumes of the pear via two methods-the water displacement method and mathematical modeling with the help of polynomial regression after which we will graph it in 3- Dimensional coordinates. Having done so, we can then calculate the percentage error margin with the theoretical and experimental volume.