CCGPS AA 6.8.1 Example 1

Compare the areas of two rectangular cross sections of an air-conditioning duct along a length of the duct that shrinks in width from 20 inches to 12 inches and in height from 8 inches to 6 inches. Find the difference of the areas, and determine the percentage that each cross section is of the other. Then, name the solid figure from which the two rectangular cross sections are formed.