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

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Carl Barron

Posts: 152
Registered: 12/13/04
Re: Geometry Problem
Posted: Feb 18, 2008 11:55 PM
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In article <>, Kaba
<> wrote:

> > 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?

> Interesting problem, couldn't solve it either. I get 4 unknowns but only
> 3 linearly independent equations.

consider triangles BDC and ECD and their angles as well as
intersecting and straight lines. Pretty easy no real equations
just bookkeeping....

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