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

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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:

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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