Ce livre traite de la g?om?trie ?l?mentaire et pr?sente des d?monstrations claires et concises pour les principaux concepts. Il est un incontournable pour les ?tudiants en math?matiques et tous ceux qui souhaitent comprendre la g?om?trie. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America,...