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An example of a circle with center O, radius r, and a point P that lies on the circle

A circle is a set of points that all lie at the same distance from a fixed point, called center. Circles come in all different sizes. We sometimes measure the distance from the center to the point on the circle and this distance is called the radius.

Circles and circular shapes
Circ1.png Circular Intersection.png Circle-Quarter.png
Circle with center C and radius r Road sign: circular intersection A Quarter
Circular-Patio.jpg Cirkelzaagblad.jpg Circle-Limit-III.jpg
Circular Patio Circle Saw Escher's Circle Limit III