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2022 W CHMMC Tiebreaker 2 - fixed point with 120^o rotation

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March 2, 2024
geometryCHMMCgeometric transformationrotation

Problem Statement

Jonathan and Eric are standing one kilometer apart on a large, flat, empty field. Jonathan rotates an angle of θ=120o\theta = 120^o counterclockwise around Eric, then Eric moves half of the distance to Jonathan. They keep repeating the previous two movements in this order. After a very long time, their locations approach a point PP on the field. What is the distance, in kilometers, from Jonathan’s starting location to PP?