1974. Concurrency Points On Euler Line

1973. A Construction For X(10020) = 22nd HATZIPOLAKIS-MONTESDEOCA POINT

1964. A Construction For X(18569)

 Let A1B1C1 reflection triangle of X(3)-circumcenter on the side lines of ABC.

Tangents to circumcircle of A1B1C1 at A1, B1, C1 form a triangle A2B2C2.*

*Circumcenter of A2B2C2 lies on Euler line of ABC. It's X(18569).

1960. Triangles Inscribed In a Conic of ABC

1952. Concyclic Points

1951. Another Circle Centered At Incenter

1944. Collinear Points

1940. Equal Area

1938. Collinear Points

1937. Concurrent Tangents

1936. An Equilateral Triangle

1935. Collinear Points

1934.A Property Of Jerabek Hyperbola

1933. A Nine-Point Center On Euler Line

1932. An Orthocenter On Euler Line

1931. A Circumcenter On Euler Line

1930. Remarks On A General Conic

1929. A Locus For K004-Darboux Cubic

1928. A Conic Centered At X(1147) Dedicated To Sir Francisco Javier García Capitán on his birthday!

1927. A Common Tangent