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Use the Pythagorean Theorem with the hypotenuse equal to 6 in. and the legs equal to x.
4.2 inches
In order to find the length of the side of the square, we need to focus on where to place the diameter, how the square's sides relate to the circle, and the numerical relationship between the square's sides and the circle's diameter.
The critical points are the places where the objects intersect. In this case, we can draw our diameter so that it meets where the circle and square touch.
We can see that the diagonal of the square is the diameter of the circle.
The square has sides length x. We can see that the diagonal of the square forms two right triangles, where the square's adjacent sides are perpendicular and become the legs of the triangles.
Substitute values
Use a calculator