9.3 part 1 (Isosceles Right Triangles)

I took chapter 9.3 and broke it into two parts. First we looked at isosceles right triangles. We used square graph paper to compute the hypotenuse of some isosceles right triangles, and we noticed a pattern to extend to any isosceles right triangle. So the students figured out that if both legs have length 'a' then the hypotenuse has length 'a*sqrt(2)'. Now to figure out how to get the 'sqrt()' symbol to work in web-pages and blogs. I'm surprised more people don't use math symbols all the time...