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Circle   (English)

Definition Niveau 1

A circle is the set of all points that can be drawn a fixed distance from a single point called the centre.
The set of points forms a path called the circumference of the circle.

Definition Niveau 2

A circle of radius r and centre point C is the set of all
points which are exactly distance r away from C.
If the radius is r, then the area of a circle is given by:
A = πr2
If the radius is r, then the circumference of a circle is given by:
C = 2πr

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