MathDB
locus of intersections of tangents

Source: V Soros Olympiad 1998-99 Round 3 11.4 https://artofproblemsolving.com/community/c2416727_soros_olympiad_in_mathematics

May 26, 2024
geometryLocusTangents

Problem Statement

A chord ABAB is drawn in a circle. On its extensions beyond points AA and BB, points PP and QQ respectively are taken such that AP=BQAP = BQ. Through PP and QQ two tangents to the circle are drawn, intersecting at point MM. Find the locus of points MM (PP and QQ move along a straight line and for any PP and QQ all possible pairs of tangents are taken, which determine four points from the desired locus of points) .