[Peach]

To to Ask.com. Then type in your question. I've been mentoring schoolkids and have used that site for some math lessons for the kids.

[Hack]

Go to MSN Search, type in "geometry proofs" and you will get a multitude of sources

[bikepacker67]

Google is your friend.

[LuigiBasco]

http://www.sparknotes.com/math/geometry3/geometricproofs/summary.html

[SilentServiceCPO]

I just googled "geometry proofs" and came up with a list of a bunch of sites, including a number for beginners that discuss the construction of proofs.

Good Luck!

[TheErnFormerlyKnownAsBig]

John Kerry's got a plan for your Daughter's geometry homework.

[Liberandos]

Try www.mymathtutor.com

It's free

[hole_n_one]

If it helps, here's 100 proof......

[GoreNoMore]

This is a small site, but may be able to give just something that will get her started

http://regentsprep.org/Regents/mathb/1c/WhatPrf.htm

[Tanniker Smith]

drmath.com

(I think that's the link, you can google "Dr. Math".
Anyway, they even provide help for homework problems.

Yup, I just checked -- that link brings you to Math Forum (http://mathforum.org)
(high school math teacher)