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The circle, centre C, with coordinates (a, b) and radius r, has equation (xa)2+(yb)2=r2. The set of points (x, y) in the plane such that (xa)2+(yb)2<r2 forms the interior of the circle, and may be called the open disc, centre C and radius r. The closed disc, centre C and radius r, is the set of points (x, y) such that (xa)2+(yb)2r2.

Subjects: Mathematics.


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