150 nice geometry problems - amir hossein parvardi
150 nice geometry problems - amir hossein parvardi
... CD at X, and a circle through C, D touches 19 Geometry Problems Amir Hossein Parvardi ∗ January 9, 2011 Edited by: Sayan Mukherjee. Note. Most of problems have solutions. Just click on the number ... ABCD whose faces are all congruent. The vertices A, B, C lie in the positive part of x-axis, y-axis, and z-axis, respectively, and AB = 2l − 1, BC = 2l, CA = 2l + 1, where l > 2. L...
Ngày tải lên: 31/03/2014, 11:02
60 geometry problems - amir hossein parvardi
... Geometry Problems - 2 Amir Hossein Parvardi ∗ October 13, 2011 1. In triangle ABC, AB = AC. Point D is the midpoint ... acute-angled triangle ABC. Prove that the incenter of triangle ABC lies inside triangle XY Z. 7 Solutions 1. http://www.artofproblemsolving.com/Forum/viewtopic.php?p=1986970 2. http://www.artofproblemsolving.com/Forum/viewtopic.php?p=1987074 3. ... http://www.a...
Ngày tải lên: 31/03/2014, 11:01
Challenging problems in geometry (dover) posamentier & salkind
... as: if a c a-b c-d b = d then -b - = -d- ? They are essential to solutions of many problems. Triangles in Proportion 7 2-1 In 6.ABC, DE II BC, FE" DC, AF = 4, and FD = 6 (Fig. 2-1 ). Find DB. Challenge ... extensions of AC and BC through C. c A & " =-8 2 PROBLEMS 1-2 In 6.ABC, a point D is on AC so that AB = AD (Fig. 1-2 ). mLABC - mLACB = 30. Find mLC...
Ngày tải lên: 15/03/2014, 15:51
math. problems and proofs combinatorics, number theory and geometry - b. kisacanin
Ngày tải lên: 31/03/2014, 16:22
problems in plane geometry (bài tập hình học phẳng) bởi i. f. sharygin
... MC can be ex- pressed by the formula S = ~~3 I a 2 _ 3d21. 7-0 1 f)57 Preface this collection will be of interest to expe- rienced geometers. Almost every geometrical problem is non- standard (as ... by the formula m a = ~ V2lJ2+ 2c 2-a 2 • 12. Given two triangles having one ver- tex A in common, the other vertices being situated on two straight lines passing 10 Problems in Plane Geomet...
Ngày tải lên: 08/04/2014, 10:42
Tạo các mặt phẳng chuẩn (REFERENCE GEOMETRY)
... Reference Geometry. Được dùng để tạo các mặt phẳng (Plane), các trục Axis, và hệ trục toạ độ. Để tạo thanh công cụ Reference Geometry ta vào Tools > Customize > Toolbars > Reference Geometry. ... 2.1.1 Tạo mặt phẳng (Plane). Click chọn Plane trên thanh công cụ Reference Geometry, hoặc vào Insert > Reference Geometry > Plane. Xuất hiện hộp thoại (hình 2.2)....
Ngày tải lên: 27/08/2012, 14:32