# Collinear Orthocenters

Requires a Wolfram Notebook System

Interact on desktop, mobile and cloud with the free Wolfram CDF Player or other Wolfram Language products.

Requires a Wolfram Notebook System

Edit on desktop, mobile and cloud with any Wolfram Language product.

Let O be the circumcenter of the triangle ABC. Let the line perpendicular to AO at O intersect AB and AC at M and N. Let the intersection of MC and NB be K. Let H and P be the orthocenters of ABC and AMN, respectively. Then H, P, and K are collinear.

Contributed by: Jay Warendorff (March 2011)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

## Permanent Citation

"Collinear Orthocenters"

http://demonstrations.wolfram.com/CollinearOrthocenters/

Wolfram Demonstrations Project

Published: March 7 2011