Question

Find the center (h,k) and radius r of the circle.

x^2 +y^2=4

a) (h,k) = (2,2); r=4
b) (h,k) = (0,0); r=4
c) (h,k) = (2,2); r=2
d) (h,k) = (0,0); r=16

Answer 1

The standard formula for a circle is

(x-h)^2 + (y-k)^2= r^2

There is no correct answer listed above.

0,0 r= 2

Answer 2

thanks