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

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rb

Posts: 1
Registered: 2/18/08
Geometry Problem
Posted: Feb 18, 2008 12:31 PM
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Hi all,

I need help with this problem:

http://img180.imageshack.us/img180/8286/20080218181526nq7.gif

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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