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area when inverting an equilateral triangle

Source: Spanish Mathematical Olympiad 1967 P6

December 4, 2022
geometryEquilateralInversion

Problem Statement

An equilateral triangle ABCABC with center OO and radius OA=ROA = R is given, and consider the seven regions that the lines of the sides determine on the plane. It is asked to draw and describe the region of the plane transformed from the two shaded regions in the attached figure, by the inversion of center OO and power R2R^2. https://cdn.artofproblemsolving.com/attachments/e/c/bf1cb12c961467d216d54885f3387b328ce744.png