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- Center - The given point from which all points of the circle are equidistant. Circles are often named by their center point.
- Radius - A segment that connects the center and any point on the circle. Its length is usually represented algebraically by $r.$
- Diameter - A segment whose endpoints are on the circle and that passes through the center. Its length is usually represented algebraically by $d.$
- Circumference - The perimeter of a circle, usually represented algebraically by $C.$

circle $O,$since it is centered at $O.$

In any given circle, the lengths of any radius and any diameter are constant. They are called

Formulas for a Circle With Radius $r$ | |
---|---|

Radius | $r=2d $ |

Diameter | $d=2r$ |

Circumference | $C=πd$ $C=2πr$ |

Area | $A=πr_{2}$ |