Polygon - Cinderella Documentation
Description: The user's guide to the Interactive Geometry Software Cinderella

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# Polygon

In this mode a polygon can be constructed from a sequence of vertices. Select the vertices in the order in which they should appear on the boundary of the polygon. Unlike the other definition modes, this mode does not expect a fixed number of input selections. You finish the creation of a polygon by selecting the first point a second time to close the polygon. For instance, if you want to construct a polygon through vertices A, B, C, and D, you have to select A, B, C, D, and A in this order.

If you made a mistake in selecting a point, you just click the point again to delete it from the boundary of the polygon. However, only the last point in the sequence can be deselected in this way.

Graphical hints guide you through the definition phase. They always resemble the part of the polygon that has been constructed so far.

1st click

For construction regular polygons there are also a variety of other modes described in the section Polygons.

#### Synopsis

Select a sequence of points to define a polygon. To finish the definition select the first point again.

#### Caution

This mode is supported only in the Euclidean, spherical, and textual views. The hyperbolic view ignores polygonal objects. The orientation of the polygon is important when one measures its area.

#### See Also

- Area
- Polygons