The answer’s pretty simple
So basically first you have to find the area of both the square and the circle which is 400 cm^2 and 100pi cm^2 respectively.
Then we subtract the area of circle from the square
So that becomes 400 - 100pi
Taking 100 common, 100(4 - pi)
Now this is for the 4 remaining corners
To get the area of the shaded region, divide the remaining area by 4
Now we get 25(4 - pi)
That’s your answer
