Well, I was testing somethings out to try and find a particular point that is a tangent to a circle and I decided to try this. I'm not too sure whether it's right or not.

I just want to know if this is true for all tangents to a circle?

http://img685.imageshack.us/img685/7...irclething.png

Uploaded with ImageShack.us

Excuse the terrible picture. I just drew it in a rush on MS Paint. (Rofl) I am hoping you can decipher it.