Date: Sun, 28 Dec 1997 00:06:44 +1100
From: Hai Trung Ho
I looked under the heading of orthocentre to look for it's properties since all the other important points (like incentre, circumcentre, centroid) have their own properties.The only property I know of the orthocentre is that if you reflect it in one of the triangle's sides, it will lie on the circumcircle. Simple angle chasing will give this result. Do you know of any other properties of the orthocentre?
Hai Trung Ho.