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Subsections

- Semicircle
- Circular arc with center through two points
- Circular sector with center through two points
- Circumcircular arc through three points
- Circumcircular sector through three points

## Arc and Sector

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

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Semicircle

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

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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.

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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.

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Circumcircular arc through three points

Marking three points produces a circular arc through these points.

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Circumcircular sector through three points

Marking three points produces a circular sector through these points.