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Topic: Geometry Problem
Replies: 17   Last Post: Feb 20, 2008 10:04 AM

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mensanator

Posts: 5,039
Registered: 12/6/04
Re: Geometry Problem
Posted: Feb 18, 2008 2:50 PM
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On Feb 18, 11:31?am, rb <r...@rb.rb> wrote:
> Hi all,
>
> I need help with this problem:
>
> http://img180.imageshack.us/img180/8286/20080218181526nq7.gif


That's not the only problem you need help with.

>
> The angle to find is ECD.
>
> The matter is solving it without trigonometric functions.
> With trigonometry or by drawing it you can see that the angle to find
> is 20? (sessagesimal) but I can't find it using a simple solution
> (properties of triangles, the parallel postulate and so on).
>
> Can you solve it?





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