Find an equation of the circle with center at (0,0) and radius r
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circle=
(x-h)SQUARE +(y-k)SQUARE =r SQUARE
=x-0 SQUARE +y-0 SQUARE
=x SQUARE +y SQUARE -r SQUARE =0
(x-h)SQUARE +(y-k)SQUARE =r SQUARE
=x-0 SQUARE +y-0 SQUARE
=x SQUARE +y SQUARE -r SQUARE =0
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