The shaded region in the figure shows
Identify the shaded region in the figure, where A and B are two sets represented by the circles and U is the universal set, which is represented by the rectangle.
In the given figure, ABCD is a rectangle in which AB=40cm and BC=25cm. If P,Q,R.S be the midpoints of AB, BC, CD and DA respectively, find the area of the shaded region.