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wu :: forums    riddles    medium (Moderators: william wu, ThudnBlunder, SMQ, Grimbal, towr, Icarus, Eigenray)    girls' geometry problem « Previous topic | Next topic » Pages: 1  Reply Notify of replies Send Topic Print    Author  Topic: girls' geometry problem  (Read 502 times) cool_joh Newbie     Gender: Posts: 50 girls' geometry problem   « on: Dec 18th, 2008, 5:30am » Quote Modify An acute triangle ABC has three heights AD, BE and CF respectively. Prove that the perimeter of triangle DEF is not over half of the perimeter of triangle ABC.   Source: China Girls' Mathematical Olympiad 2002 IP Logged MATH PRO 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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