111.41.c.12.E
111 111.41 111.41.c 111.41.c.12 111.41.c.12.E
show that the equation of a circle with center at the origin and radius $r$ is $x^2 + y^2 = r^2$ and determine the equation for the graph of a circle with radius r and center $(h, k)$, $(x - h)^2 + (y - k)^2 =r^2$.
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