# Ellipse: n equal arcs (debug)

- Author:
- Jack Kelley

- Topic:
- Ellipse

**SPECIFY**: an ellipse, an integer

*n*≥ 2, and a point

*Z*on that ellipse.

*Change the ellipse by moving its foci (F, F') or the point E on its perimeter. Change n and Z by using the sliders.*

**ACTION**: Divide the ellipse into

*n*arcs of equal length, starting at point

*Z*.

**METHODS**: Two methods are provided. Full details may be found in their "On Click" scripts. Both methods use the Minimize command.

- The
**DIVIDE_{n ≥ 5}**script is elegant, but fails for*n*∈ {2,3,4}. - The
**DIVIDE_{n ≥ 2}**script is robust, but makes heavier use of the Execute command.

**WARNING: When using DIVIDE_{n ≥ 5}, a bug can occur after changing n.**This bug was not present during development with the Windows version of GeoGebra.**WORKAROUND: After changing n, run Clear Division immediately before running DIVIDE_{n ≥ 5}.**