Bob

]]>Will this page do?

http://www.proofwiki.org/wiki/Triangle_ … e_Equality

Bob

]]>http://www.math.washington.edu/~king/coursedir/m444a03/notes/congruence%20html/tri-congruence-summ.html

That includes proof for the congruence criterias.]]>

Sorry, I'm not being awkward just to be nasty. I really have never seen any proofs for this sort of thing. I think congruency appears very early in Euclid (trying to check this now) and properties of kites much later. So I'm worried that this proof leads to a circular argument. I'll try to find out.

Bob

]]>.... they make a kite................. That proves that the triangles are congruent.

Why does it prove that?

The kite has the right properties but are you sure that those properties don't depend on congruency (circular argument).

Bob

]]>Followed the link to

http://www.proofwiki.org/wiki/Triangle_ … e_Equality

Is that enough?

Bob

]]>Let me be specific. The diagram below has two triangles.

Corresponding sides are equal as shown. So what can you prove from this?

Bob

]]>Seeing how it has been two years since I have done axiomatic geometry, I do not remember what can and what cannot be used in the proof...

]]>Bob

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