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Topic: Help with geometry proofs
Replies: 2   Last Post: Aug 6, 2009 10:31 PM

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Ken Pledger

Posts: 4
Registered: 8/6/09
Re: Help with geometry proofs
Posted: Aug 6, 2009 10:31 PM
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> I need help with a few proofs ....
> http://img14.imageshack.us/img14/7230/geometryquestion
> s.jpg
> ....


First you need to explain what sort of theory or axioms underlie all this, because that determines what techniques can be used.

I can see how to do #1 directly, but the instruction "Prove indirectly" is quite puzzling. Also, ## 2, 3 and 4 need more information than the diagrams show. In #2 I guess AC is meant to be a diameter. In #3 you need some information about lengths or angles in those triangles. In #4 the rhombus has to be special in some way before you can prove it is a square. It would be best to post the _complete_ wording of the original questions, as the details do matter.

Ken Pledger.



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