Answer:
20 inches
Step-by-step explanation:
To find the area of the shaded part, let's use the following formula:
Area of shaded area = Area of rectangle - Area of square
Now, apply the formula and find the answer:
Area of shaded area =
×
-
× 
= 
= 
<em>∴ The area of the shaded area is 20 inches.</em>
<em>Hope this helps...</em>