Take a look at
http://www.jiskha.com/display.cgi?id=1394471353
and plug in your points instead
Find the circumcenter of angle EFG with E(4,4), F(4,2), and G (8,2).
3 answers
find the circumcenter of triangle efg with e(4 4) f(4 2) and g(8 2)
(3,6)