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wu :: forums    riddles    medium (Moderators: SMQ, towr, Grimbal, Eigenray, ThudnBlunder, william wu, Icarus)    collinear points « Previous topic | Next topic » Pages: 1  Reply Notify of replies Send Topic Print    Author  Topic: collinear points  (Read 282 times) tony123 Junior Member     Posts: 61 collinear points   « on: Nov 17th, 2007, 1:43am » Quote Modify A, B, C, D are collinear points in this order. Draw the regular triangles ABE and CDF on one side of the line. Let G denote the intersection of the circles ACE and BDF on the same side of the line ABCD. Prove that < AGD=120 °. IP Logged Pages: 1  Reply Notify of replies Send Topic Print Forum Jump: ----------------------------- riddles -----------------------------  - easy => medium   - hard   - what am i   - what happened   - microsoft   - cs   - putnam exam (pure math)   - suggestions, help, and FAQ   - general problem-solving / chatting / whatever ----------------------------- general -----------------------------  - guestbook   - truth   - complex analysis   - wanted   - psychology   - chinese « Previous topic | Next topic »

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