#### Answer

Center: $(0, 2)$;
radius = 2 units
Refer to the image below for the graph.

#### Work Step by Step

RECALL:
The circle $(x-h)^2+(y-k)^2=r^2$ has its center at $(h, k)$ and a radius of $r$ units.
The given circle can be written as $(x-0)^2+(y-2)^2=2^2$.
This equation is in the same form as the one in the recall part above so its center is at $(0, 2)$ and its radius is $2$ units.
Plot the center.
Then, points that are:
2 units above the center: $(0, 4)$
2 units below the center: $(0, 0)$
2 units to the left of the center: $(-2, 2)$
2 units to the right of the center: $(2, 2)$
Then, connect the points using a curve to form a circle.
(refer to the attached image in the answer part above)