The perimeter of a rectangle is 20 feet and the foot-measure is each side is a whole number. How many rectangles with different shapes satisfy these conditions?

You would times them together

As the sides of the rectangle are whole numbers, the possible values for the sides based on the above condition are 1 by 9, 2 by 8, 3 by 7, 4 by 6, and 5 by 5.

There are 5 different rectangles for the given conditions.