The Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.


Math Forum » Discussions » sci.math.* » sci.math

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

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Carl Barron

Posts: 152
Registered: 12/13/04
Re: Geometry Problem
Posted: Feb 18, 2008 11:55 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

In article <MPG.22243347aced4a5d9899a1@news.cc.tut.fi>, Kaba
<none@here.com> wrote:

> > 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?

>
> 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....



Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2017. All Rights Reserved.