## Hyperbola by Foci

This mode constructs a hyperbola defined by two foci and one perimeter point. After selecting the mode one has to click focus1, focus2, 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 Tuesday 06 of December, 2005 [00:01:12 UTC].
The original document is available at http://doc.cinderella.de/tiki-index.php?page=Hyperbola%20by%20Foci