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garden has right angled triangle shape that lies on island of circular shape

Source: 2021 Dürer Math Competition Finals Day2 E7 https://artofproblemsolving.com/community/c2749870_

January 8, 2022
geometry

Problem Statement

Jimmy’s garden has right angled triangle shape that lies on island of circular shape in such a way that the corners of the triangle are on the shore of the island. When he made fences along the garden he realized that the length of the shortest side is 3636 meter shorter than the longest side, and third side required 4848 meter long fence. In the middle of the garden he built a house of circular shape that has the largest possible size. Jimmy measured the distance between the center of his house and the center of the island. What is the square of this distance?