**Arc of a Circle**

A connected section of the circumference of a circle.

Arcs are measured in two ways: as the measure of the central angle, or as the length of the arc itself.

Measurement by central angle | The red arc (minor arc) measures 120°. The blue arc (major arc) measures 240°. | |

Measurement by arc length (radians) | Formula: Red arc: Blue arc: |

**See also**

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