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You find the area of the whole square first. Then you find the area of the circle inside of it And then subtract the area of the circle from the area of the square and then you get the shaded area of the square
The area of the square is 98 square cm. Assuming the shaded area is the remainder of the circle, its area is 55.9 square cm (approx).
A square with an area of 400 square units has a perimeter of 80 units.
The area of square is : 39.69
Take the square root of the area.