geometry puzzle

[cellio]

You're being too productive; let me help:

World's hardest easy geometry problem, forwarded by a coworker, allegedly solvable with pure geometry (no trigonometry).

Comments

[dagonell.livejournal.com]

I did this back in high school. Our math professor used to give out puzzles to solve. First student with a correct solution got a dollar. At the beginning of the semester they were fairly easy
"If 5 cats can catch 5 mice in 5 minutes, then how many cats are needed to catch 100 mice in 100 minutes?" The triangle one was towards the end of the semester, I spent several weeks at it. Hint: Extend line DE down to match AB.
-- Dagonell