Try this Drag one of the orange dots that define the endpoints of the blue arc.
The yellow area is a segment of the circle C.

The chord AB in the figure above defines one side of the segment. As you drag the points you will notice that the segment is always the smaller part of the circle. This is a definition of a segment. Its Central Angle is always less than 180°

In fact, if the chord divides the circle exactly in half (becoming a diameter) neither of the two halves are segments. They are semicircles. If you careful with the mouse, you can create this situation in the figure above. Move A or B so that the line AB passes through the center of the circle. No segment is then present.

Arc Length | The length of the curved arc line. See Arc Length page for more. |

Radius |
The radius of the circle of which the segment is a part.
See Radius of an Arc or Segment for ways to calculate the segment radius when you know other properties of the segment. |

Central Angle | The angle subtended by the segment to the center of the circle of which it is a part.
See Central Angle definition for more. |

Area | See Area of a Segment of a Circle |

- Circle definition
- Radius of a circle
- Diameter of a circle
- Circumference of a circle
- Parts of a circle (diagram)
- Semicircle definition
- Tangent
- Secant
- Chord
- Intersecting chords theorem
- Intersecting secant lengths theorem
- Intersecting secant angles theorem
- Area of a circle
- Concentric circles
- Annulus
- Area of an annulus
- Sector of a circle
- Area of a circle sector
- Segment of a circle
- Area of a circle segment (given central angle)
- Area of a circle segment (given segment height)

- Basic Equation of a Circle (Center at origin)
- General Equation of a Circle (Center anywhere)
- Parametric Equation of a Circle

- Arc
- Arc length
- Arc angle measure
- Adjacent arcs
- Major/minor arcs
- Intercepted Arc
- Sector of a circle
- Radius of an arc or segment, given height/width
- Sagitta - height of an arc or segment

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