You are using a browser not supported by the Wolfram Cloud
Supported browsers include recent versions of Chrome, Edge, Firefox and Safari.
I understand and wish to continue anyway »
WOLFRAM NOTEBOOK
A Collinearity between the Nine-Point Center, the Foot of an Altitude, and a Midpoint
A Collinearity between the Nine-Point Center, the Foot of an Altitude, and a Midpoint
Let ABC be a triangle with nine-point center N. Let B' be the foot of the altitude from B. Let the circumdiameter through B intersect AC at D. Let the midpoint of BD be M. Then M, N, and B' are collinear.