Keywords:
Area, jewelry, rectangle, dimensions, width, length
For this case we must find the area of a jewel in the form of a rectangle, given the dimensions of width and length. By definition, the area of a rectangle is given by:
. Where "a" is the width and "b" is the length.
As data we have:

Then the area is given by:

So, the area of the jewelry is

Answer:
The area of the jewelry is 216 square feet
Option D