Answer
See graph
Work Step by Step
We are given the equation:
$x^2+y^2=4$
The equation represents a circle. Identify $h,k,r$:
$(x-h)^2+(y-k)^2=r^2$
$h=0$
$k=0$
$r^2=4\Rightarrow r\sqrt 4=2$
Determine the circle's center:
$(h,k)=(0,0)$
Graph the circle of center $(0,0)$ and radius $r$:
