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Quadrant
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 diameter of the circle is congruent to the length of the diagonal of the inside square. If you know the length of one side of the square, you can use pythagorean's theorem to solve for its diagonal (hypotenuse) and thusly the square's diameter.
The radius of a circle, if the area is 22 square meters, is: 2.646 meters.
If the area of a circle is 20 square inches the diameter is: 5.046 inches.