MMO 351 Moscow MO 1957 locus of 4th vertex of rectangle
Source:
August 20, 2019
geometryLocusrectangleconcentric circles
Problem Statement
Given two concentric circles and a pair of parallel lines. Find the locus of the fourth vertices of all rectangles with three vertices on the concentric circles, two vertices on one circle and the third on the other and with sides parallel to the given lines.