1963. A Triangle Inscribed In Nine-Point Circle

 Let A1B1C1 median triangle of ABC.

A2: Inverse of X(3)-Circumcenter of ABC in the circle with diameter B1C1. 
Define B2, C2 cyclically.

*A2B2C2 is inscribed in the Nine-Point Circle of ABC.

1959. Circumcenter On Euler Line

1933. A Nine-Point Center On Euler Line

1932. An Orthocenter On Euler Line

1881. Circles Through Poncelet Point

1880. Poncelet Related

1867. A Locus for K060 and Q161: K001-K060 half-way quartic

1842. Collinear Points

1816. Tripling The Nine Point Circle

1605. Isogonal Cevians and Circular Points