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Math Forum » Discussions » Math Topics » geometry.pre-college.independent

Topic: Pentagram geometry
Replies: 3   Last Post: Oct 28, 2008 3:11 PM

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Dan Cass

Posts: 442
Registered: 12/6/04
Re: Pentagram geometry
Posted: Oct 28, 2008 2:12 PM
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> Does anybody have any idea what to do to prove that
> FG is concurrent to DE?
>
> [img]http://img241.imageshack.us/img241/9613/pentagram
> vy2.png[/img]
>
> The only stuff we know from the task is:
> AD=AE
> 4 * DB * EC = DE^2


what does it mean to say "FG is concurrent to DE"?



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