Volumes of cross sections refer to calculating three-dimensional volumes by integrating cross-sectional areas along a given axis.
Cross-sectional Area: Cross-sectional area is the two-dimensional area of a shape obtained by slicing through a three-dimensional object.
The disk method is a technique for finding volumes by integrating cross-sectional areas using disks or circles.
The washer method is another technique for finding volumes that involves subtracting one cross-sectional area from another to create a "washer" shape.