C.a.R.– Compass and Ruler (also known as Z.u.L., which stands for the
German
German(s) may refer to:
* Germany (of or related to)
**Germania (historical use)
* Germans, citizens of Germany, people of German ancestry, or native speakers of the German language
** For citizens of Germany, see also German nationality law
**Ger ...
"Zirkel und Lineal") — is a free and open source
interactive geometry app that can do geometrical constructions in
Euclidean and
non-Euclidean geometry
Geometry (; ) is, with arithmetic, one of the oldest branches of mathematics. It is concerned with properties of space such as the distance, shape, size, and relative position of figures. A mathematician who works in the field of geometry is c ...
.
The software is
Java
Java (; id, Jawa, ; jv, ꦗꦮ; su, ) is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea to the north. With a population of 151.6 million people, Java is the world's List ...
based.
The author is René Grothmann of the
Catholic University of Eichstätt-Ingolstadt
The Katholische Universität Eichstätt-Ingolstadt (KU) is a Roman Catholic research university in Eichstätt and Ingolstadt, Bavaria, Germany.
Compared to other German universities it is a rather small institution with 4,800 students in 2019; n ...
.
It is licensed under the terms of the
GNU General Public License
The GNU General Public License (GNU GPL or simply GPL) is a series of widely used free software licenses that guarantee end users the Four Freedoms (Free software), four freedoms to run, study, share, and modify the software. The license was th ...
(GPL).
Assignments
Assignments make possible to create Java applets, for a construction exercises.
These applets can be used from the command line using the
AppletViewer
AppletViewer is a standalone command-line program from Sun to run Java applets. Appletviewer is generally used by developers for testing their applets before deploying them to a website.
As a Java developer, it is a preferred option for running J ...
.
(Previously, they could be run in a browser, but Java support in browsers has been disabled in recent years.)
See also
*
Graphmatica
*
GeoGebra
GeoGebra (a portmanteau of ''geometry'' and ''algebra'') is an interactive geometry, algebra, statistics and calculus application, intended for learning and teaching mathematics and science from primary school to university level. GeoGebra is av ...
*
CaRMetal
CaRMetal is an interactive geometry program which inherited the C.a.R. engine. The software has been created by Eric Hakenholz, in Java. CaRMetal is free, under GNU GPL license. It keeps an amount of functionality of C.a.R. but uses a different ...
*
Compass-and-straightedge construction
In geometry, straightedge-and-compass construction – also known as ruler-and-compass construction, Euclidean construction, or classical construction – is the construction of lengths, angles, and other geometric figures using only an ideali ...
External links
C.a.R. History of the C.a.R.
Free educational software
Free interactive geometry software
Java platform software
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