Answer:
"area of the circle – area of the triangle + area of the square"
Explanation:
The figure is shown in the attached pic.
The red region is what we are looking for.
First of all, the area of square is the area of square.
Now we need to find the 3 sort of semicircles around. That can be found if we subtract the area of the triangle from the area of the circle.
Now, we have:
Area of Circle - Area of Triangle + Area of Square
That is Option D, last option.