# Double Integral on Rectangular Region

## Description

Illustration of the planar slices that are added up (integrated) to give the volume under a surface.
A is a small volume dx thick with a surface area of integral of which can be evaluated at any location. By then integrating from to the volumes made by multiplying the integrated area and the thickness, , the full volume can be obtained.
The direction of the slices can be switched and the final volume should be the same provided is continuous throughout the region.

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