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''union'' of circles that contain a given square

Source: Spanish Mathematical Olympiad 1968 P3

December 4, 2022
geometrysquarecircles

Problem Statement

Given a square whose side measures aa, consider the set of all points of its plane through which passes a circumference of radius whose circle contains to the quoted square. You are asked to prove that the contour of the figure formed by the points with this property is formed by arcs of circumference, and determine the positions, their centers, their radii and their lengths.