CabriWorld 2001
Introduction to hyperbolic geometry using Cabri
Tim Lister, The Open University, Great Britain
email:
t.c.lister@open.ac.uk
The following HTML pages and CabriJava figures are the notes of a presentation
given at UQAM, Montreal, in July. They are based on computer laboratory
sessions that I run at a geometry summer school in England. In these,
Hyperbolic 2 space modeled by the Poincaré disc, is explored using
a Cabri menu bar with an extensive set of commands that I wrote in 1998.
The Menu Bar
The four new pull down icons on the menu
bar each provide a number of commands of a
similar nature.
The four sections can be roughly categorised
as follows;
• Figures ; commands for drawing lines, line
segments (or arcs), and standard figures in the
disc.
• Constructed lines and points ; perpendiculars,
midpoints etc.
• Reflections ; reflection (or inversion)
of figures about a disc line.
• Measurements ; non Euclidean distance between
points, angles and triangle sums.
Help, using the standard Cabri help item,
is available for each of the commands.
This menu bar can be found on my web site together with full instructions
for all of the commands. Download
the file Hyperbol.men...or downloaded
from these pages.
I can be contacted by email at t.c.lister@open.ac.uk
References are given at the end for similar menus and sites available
elsewhere on the web.
Contents