Please Register or Log in to view the hidden image! Find the radius of the circle View attachment 7290 While the answer is immedieately obviouse to me, actually working it out was more difficult. What is the simplest, or even most complex way to work it out? I'll share my method later on.

http://mathcentral.uregina.ca/QQ/database/QQ.09.06/s/lori1.html r = (6 + sqrt(76)) / 4 = 3.67944947177…, approximately

The equation at the link provided has two solutions: 1 & 5 1 is a solution which does not match the diagram, leaving 5 as the correct answer.

Let's see if that works: (5-2)^2 + (5-1)^2 = (9+16) = 5^2 = 25. Yep. radius if 5 alright. I was trying to use the quadratic equation. Goofed. Thanks.