Answer :

AL2006
The radius is the square root of 10 ... about 3.162 .
luana
[tex](x+2)^2+y^2=10\\\\ general\ equation\ for\ circle\\ (x-a)^2+(y-b)^2=r^2\\\\ so\ r^2=10\ square\\ r=\sqrt{10}\ -radius\ of\ circle [/tex]