Final answer:
The question likely refers to the concept of a Volume of revolution in mathematics, which involves calculating the volume of a 3D solid formed by revolving a 2D shape.
Step-by-step explanation:
The question refers to a solid that is a portion of a paraboloid, and the student is asked to identify the mathematical concept that the described solid exemplifies. Among the given options - (a) Volume of revolution, (b) Double integration, (c) Surface area calculation, and (d) Parametric equations - the correct answer is most likely (a) Volume of revolution, as this concept involves calculating the volume of a solid that is formed by revolving a two-dimensional shape around an axis.
However, without the visual representation or further context, it's challenging to be certain of the exact method used. The examples involving line integrals, the calculation of an electrical field, and volume and area algorithms suggest that the problem might be approached using parametric equations or double integration depending on the specifics of the solid in question.