# A Concurrency of Lines Joining Orthocenters

Requires a Wolfram Notebook System

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

Let ABC be a triangle with incenter I. Let A', B' and C' be the excenters opposite A, B, and C, respectively. Then the lines joining the orthocenters of IBC and A'BC, IAC and B'AC, and IAB and C'AB are concurrent.

Contributed by: Jay Warendorff (March 2011)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

## Permanent Citation

"A Concurrency of Lines Joining Orthocenters"

http://demonstrations.wolfram.com/AConcurrencyOfLinesJoiningOrthocenters/

Wolfram Demonstrations Project

Published: March 7 2011