Does anyone know how to deal with Wikipedia? I tried this morning to make a very modest edit to the Circumscribed_circle article, and someone else keeps reverting it back. All I'm trying to do is to add an external link to my article about computing the circumcenter coordinates using complex numbers: http://home.pipeline.com/~hbaker1/FAQ-circumcircle.txt My result is a generalization of the classic formula: R=abc/(4 A), where R is the radius of the circumcircle, a,b,c are the side-lengths, and A is the area. Now consider R,a,b,c to be "vectors" in the complex plane -- i.e., complex numbers. Then the previous formula is |R|=|a||b||c|/(4 A) My formula is: R = -ia'bc/(4 A) where i=sqrt(-1), and a' is conjugate(a). Note that the multiplications in my formula are now _complex_ multiplies. I think that this is a cool formula, and I believe that Gosper thought so, too. Can someone here please help me make this change? Thanks.