Question

x2 + y2 = 4
center (, )
radius =

Answer 1

center(0,0)
r=2

Answer 2

how did you get that

Answer 3

general form is \((x-h)^2+(y-k)^2=r^2\) for a circle with center \((h,k)\) and radius \(r\)
put your example in this form by writing \((x-0)^2+(y-0)^2=2^2\) and then you can read off the answer, center is \((0,0)\) radius is 2

Answer 4

Thanks you both,i think I have it now