11.2 & 12.3 Ratios of Perimeters, Areas, and Volumes
Something that may help you understand and remember how to find the ratios of perimeters, areas, and volumes of similar and non-similar figures.
(Since areas of figures can be broken down into a bunch of squares/portions of squares and volumes of figures can be broken down into a bunch of cubes/portions of cubes, you can think about how the result would extend to more general figures).