### An Anticomplementary Triangle Surprise: What Is It About?

A Mathematical Droodle

The applet purports to demonstrate a surprising result in triangle geometry: two step Napoleon's triangle construction yields the *anticomplementary triangle*, i.e. the triangle formed by the straight lines passing through the reference triangle's vertices parallel to the opposite sides.

|Activities| |Contact| |Front page| |Contents| |Geometry|

Copyright © 1996-2018 Alexander Bogomolny

70768195