Draw in the rest of the circle, it will pass through the corner of the squareOriginally Posted byNatasha1

as shown in the diagram (a point from which the diameter of a circle

subtends a right angle is on the circle).

We can see from the diagram that the diagonal of the square is:

,

now if the side of the square is the diagonal is:

,

from which you can finish the problem.

RonL