Saturday, July 24, 2021

1744. A Circle Centered at X(5)-NPC center and Locus for K018

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Friday, July 23, 2021

1743. Another Circle Centered at X(5)-NPC center

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1742. Concyclic Centroids

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1741. Perspective Triangles

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Saturday, July 17, 2021

1740. Euler to Euler

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Saturday, July 10, 2021

1739. An Equilateral Triangle

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Friday, July 9, 2021

1738. An Inspiration Of Antreas Hatzipolakis's Problem

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1737. A Circumcubic

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Friday, July 2, 2021

1736. Circle From Orthocenters

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1735. Circle From De Longchamp's Points

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1734. Circle From Nagel's Points

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Thursday, July 1, 2021

1733. Bicentric Pairs

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1987. Circumcenter On Euler Line

 Let H=X(4)-Orthocenter of ABC. A 1 B 1 C 1 cevian triangle of H. B1 A , C1 A are reflections of B1, C1 on A. L A , line through B1 A , C1...