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computational, 8 equal circles inside a right triangle

Source: 2011 XIV All-Ukrainian Tournament of Young Mathematicians, Qualifying p2

May 18, 2021
right triangleequal circlesgeometryUkrainian TYM

Problem Statement

Eight circles of radius rr located in a right triangle ABCABC (angle CC is right) as shown in figure (each of the circles touches the respactive sides of the triangle and the other circles). Find the radius of the inscribed circle of triangle ABCABC. https://cdn.artofproblemsolving.com/attachments/4/7/1b1cd7d6bc7f5004b8e94468d723ed16e9a039.png