Answer:
8 is the radius.
Step-by-step explanation:
The standard form of a circle is [tex](x-h)^2+(y-k)^2=r^2[/tex].
However, I like to call it center-radius form because it tells us the center and the radius.
The center is [tex](h,k)[/tex] and the radius is [tex]r[/tex].
So your equation is [tex](x-0)^2+(y-0)^2=8^2[/tex].
So the center for this circle is (0,0) and the radius is 8.
If it wasn't so obvious that [tex]8^2[/tex] is 64 then you could have entered [tex]\sqrt{64}[/tex] in your calculator to get 8.
