$(1).\,\,\,$ $(x-a)^2+(y-b)^2$ $\,=\,$ $r^2$
$(2).\,\,\,$ $(x-h)^2+(y-k)^2$ $\,=\,$ $r^2$
Learn the equation of a circle in standard form and geometric proof in the two dimensional space.
$x^2+y^2$ $\,=\,$ $r^2$
Learn the standard equation of a circle centered at the origin of the two dimensional cartesian coordinate system with geometrical proof.
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