### Hyperbola by Foci

This mode constructs a hyperbola defined by two foci and one perimeter point. After selecting the mode one has to click the first focus point, the second focus point, and a perimeter point in this order.

#### Synopsis

A hyperbola is constructed from two foci and a perimeter point.

#### Caution

Due to the continuity behavior of Cinderella it may happen that while free elements are being moved, a hyperbola transforms continuously into a ellipse. This may happen if one of the foci passes through infinity.

#### See Also

- Ellipse by Foci
- Parabola by Focus and Directrix

Page last modified on Sunday 04 of September, 2011 [19:16:17 UTC].
The original document is available at http://doc.cinderella.de/tiki-index.php?page=Hyperbola%20by%20Foci