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Far less interesting than Poncelet's Porism

Source: India Postal Set 2 P 5 2016

January 18, 2017
geometryincircle3D geometryprism

Problem Statement

Two triangles ABCABC and DEFDEF have the same incircle. If a circle passes through A,B,C,D,EA,B,C,D,E prove that it also passes through FF.
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