Thu-Huyen Dao

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We give a simple proof of Gibert's generalization of the Lester circle theorem. The famous Lester circle theorem states that for a triangle, the two Fermat points, the nine point center and the circumcenter lie on a circle, the Lester circle of the triangle. Here is Gibert's generalization of the Lester circle theorem, given in [2] and [4, Theorem 6]: Every(More)
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