<h2>Explanation:</h2><h2></h2>
Hello! Remember you have to write complete questions in order to get good and exact answers. Here you haven't provided any diagram so I'll assume we are talking about a square. If so, then the area of the square is given by:
From the figure below, we know that the side of the square is:
So the area can be found as:
Finally:
<em>The shaded region has an area of 40 square meters</em>