This video covers the 2-D type of problem, where they give you two similar shapes -- either squares or circles or triangles or amorphous blobs -- and just enough info to figure out the area and perimeter of one based on the other. You won't believe what you have to do with the scale factor for area!
Volume & Surface Area of Similar 3-D Objects
Based on info about one of the objects -- and perhaps a scale factor -- you're expected to find the surface area and volume of the second object. Also explained is the exponential relationship between scale factors for surface area and volume, and a good way to remember them.
If you do not have an account, you should get one, because it is awesome! You can save a playlist for each test or each chapter, and save your "greatest hits" into a "watch right before the final" list (not that we recommend cramming, but when in Rome...)