The length of the rectangle is labeled 2 inches. the width of the rectangle is labeled 3.5 inches. the scale is 1 to 20.

In order to determine the exact length and width of the rectangle based on the labels, multiple the labels with that of the scaling ratio. In this example, every 1-inch drawing corresponds to 20 inches in reality. Therefore, the length labeled 2 inches is 40 inches and the width labeled 3.5 inches is 70 inches in reality. Thus, the real dimension of the rectangle is 40 in by 70 in. 

Add up all the sides