Pobelter is in the club 20 xx and SSBM Hax is the real Hax $. He ' s the best TF one trick in NA . <| sep |> Because I couldn ' t make it to my family ' s thanksgiving . so I ' m here , at my house , with my roommates family , and I know Noone around besides my roommate and he busy with his family <| sep |> It could have been an essential role , had he not fucked it up . 3 <| sep |> I ' m not a mathematician , and my mathematical knowledge doesn ' t extend beyond the undergraduate level in most fields , so I ' m not sure what most professional geometers would recommend . Depends a lot on which specific later topics you ' re interested in , I expect . I don ' t think Kiselev or the AoPS book is going to be quite what you ' re asking for . In terms of content they ' re both fairly typical high school geometry books , just a bit more rigorous than some watered down American textbooks I ' ve seen , with better problems . You should take a look at the Coxeter and Greitzer book though . One other book you might look at is Felix Klein ' s Elementary Mathematics from an Advanced Standpoint . For use in physics , computer modeling for graphics , games , robotics , computer vision , cartography , physical simulation , and the like , etc . , I think Hestenes style geometric algebra should be taught to bright high school students and most undergraduates in technical fields . Cf . Reforming the Mathematical Language of Physics , Primer on Geometric Algebra , Grassmann ' s Vision . In particular the conformal model is really powerful and pleasant to work with , cf . or if you don ' t want to buy a book , try this Ph . D thesis ~ rjw 57 pdfrwarehampdhthesis . pdf . It sounds like you might be interested in a math history book though . I like Stillwell ' s pretty well .