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Area of the square is 9,therefore side length of square is 3 units. length of diagonal of suare is =sqrt{3^2+3^2} =3sqrt{2} Area of circle=pi*[3sqrt{2}]^2 =18pi =18*22/7 =56.57(approx.)

We know the formula for the area of a circle is and for a square it is .

The "r" is the diagonal. Now let's find the side of the square. It is . Use trigonometry to find the diagonal.

We know two angles, namely the right angle and the 45.We know on side and considering the right angle is , the hypotenuse is the diagonal and the other side of the square is the opposite. Find the sine.