Answer
$${\text{The equation represents a circle with radius }}r = 10$$
Work Step by Step
$$\eqalign{
& r = 10 \cr
& {\text{Convert to rectangular form, using }}x = r\cos \theta ,{\text{ }}{r^2} = {x^2} + {y^2} \cr
& \sqrt {{x^2} + {y^2}} = 10 \cr
& {x^2} + {y^2} = 100 \cr
& {\left( {x - h} \right)^2} + {\left( {y - k} \right)^2} = {r^2} \cr
& {\text{The equation represents a circle with radius }}r = 10 \cr
& {\text{centered at the origin}}{\text{.}} \cr
& {\text{Graph}} \cr} $$
