Kylie: Try going to mathforum.com and check out their Ask Dr. Math section. This question has been asked before and they have lots of good answers there. And if they haven't answered your question already, they will - just ask. It might help you to "provide some food for thought" for your teacher. And remember, be gracious with the added knowledge....you both can learn something from this experience.
Kylie Smith wrote:
> I'm in year 11 and my math teacher said that there was no real > properties of orthocenters. I love to prove her wrong and would love > to know all of your other theories on this topic. Please email me with > your views and insights.