Okay, here we have this:
Considering the provided measures, we are going to calculate the requested area, so we obtain the following:
So let's remember that a sheet is rectangular, and the area of a rectangle is equal to height times width, therefore substituting we have:
Area of a piece of legal paper=8.5 inches * 14 inches
Area of a piece of legal paper=119 square inches.
Finally we obtain that the Area of a piece of legal paper is 119 square inches.