Desargues' theorem: Two triangles are in perspective axially if and only if they are in perspective centrally. I was wondering if this particular configuration was correct: http://garciacapitan.99on.com/bella/imgs/desarg2.gif http://garciacapitan.99on.com/bella/imgs/desarg2.gif (copy-paste the link ir it doesnt show you the image or doble click on the attached thumbnail) I don't know if it is even possible for the center of perspectivity (O) be in-between the two triangles. Also I believe that the perspectivity axis (P,Q,R) isn't horizontal. My first thought was that the correspondent vertices were wrongly located but then again I found this in a geometry book. So please could you help me? Are the correspondent vertices wrongly located or am I not undertanding? HELP please!