Propeller theorem

by luimichael, Jun 17, 2006, 3:21 PM

The propeller theorem. :idea:
http://www2.hkedcity.net/sch_files/a/lpl/lpl-lsk/public_html/propeller.GIF

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What is the theorem? :maybe:

by nayel, Sep 6, 2007, 5:54 PM

a