In a city planning project, an architect is designing a new park. The park includes a large circular fountain at its center, surrounded by a decorative landscape, also in the shape of circle that shares the same center as the fountain. The architect wants to place four identical statues equidistant from each other as part of the decorative landscape, such that the statues form a square. If the diameter of the fountain is 20 meters, calculate the distance between each statue and the nearest edge of the fountain, and prove that the statues indeed form a square.