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Romania 7

Source: IMO LongList 1959-1966 Problem 39

September 2, 2004
geometrycircumcirclecircleIntersectionIMO ShortlistIMO Longlist

Problem Statement

Consider a circle with center OO and radius R,R, and let AA and BB be two points in the plane of this circle. a.) Draw a chord CDCD of the circle such that CDCD is parallel to AB,AB, and the point of the intersection PP of the lines ACAC and BDBD lies on the circle. b.) Show that generally, one gets two possible points PP (P1P_{1} and P2P_{2}) satisfying the condition of the above problem, and compute the distance between these two points, if the lengths OA=a,OA=a, OB=bOB=b and AB=dAB=d are given.