Arc and Sector

The algebraic value of an arc is its length, the value of a sector is its area.

Semicircle

Marking two points A and B produces a semicircle above the segment AB.

Circular arc with center through two points

Marking three points M, A and B produces a circular arc with center M, starting point A and endpoint B. Note: point B does not have to lie on the arc.

Circular sector with center through two points

Marking three points M, A and B produces a circular sector with center M, starting point A and endpoint B. Note: point B does not have to lie on the sector.

Circumcircular arc through three points

Marking three points produces a circular arc through these points.

Circumcircular sector through three points

Marking three points produces a circular sector through these points.