Arc and Sector Tools

Note: In GeoGebra, the algebraic value of an arc is its length. The value of a sector is its area.

mode_circlearc3_32 Circular Arc with Center between Two Points

First, select the center point M of the circular arc. Then, select the starting point A of the arc, before you select a point B that specifies the length of the arc (also see command CircularArc).

Note: While point A always lies on the circular arc, point B does not have to lie on it.

mode_circlesector3_32 Circular Sector with Center between Two Points

First, select the center point M of the circular sector. Then, select the starting point A of the sector’s arc, before you select a point B that specifies the length of the sector’s arc (also see command CircularSector).

Note: While point A always lies on the sector’s arc, point B does not have to lie on it.

mode_circumcirclearc3_32 Circumcircular Arc through Three Points

Selecting three points A, B, and C creates a circular arc through these points. Thereby, point A is the starting point of the arc, point B lies on the arc, and point C is the endpoint of the arc (also see command CircumcircularArc).

mode_circumcirclesector3_32 Circumcircular Sector through Three Points

Selecting three points A, B, and C creates a circular sector through these points. Thereby, point A is the starting point of the sector’s arc, point B lies on the arc, and point C is the endpoint of the sector’s arc (also see command CircumcircularSector).

mode_semicircle_32 Semicircle

Select two points A and B to create a semicircle above the segment AB (also see command Semicircle).


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