Answer
(a) $(0,0)$, $2$. (b) see graph. (c) $(\pm2,0)$, $(0,\pm2)$,
Work Step by Step
(a) Given $x^2+y^2=4$, we can identify its center $(h,k)=(0,0)$ and radius $r=2$.
(b) see graph.
(c) We can find the x-intercepts $(\pm2,0)$ and y-intercepts $(0,\pm2)$,
