C.a.R. (Compass and Ruler), also known as Z.u.L. (), is a free and open source
interactive geometry app that can do geometrical constructions in
Euclidean and
non-Euclidean
In mathematics, non-Euclidean geometry consists of two geometries based on axioms closely related to those that specify Euclidean geometry. As Euclidean geometry lies at the intersection of metric geometry and affine geometry, non-Euclidean geo ...
geometry
Geometry (; ) is a branch of mathematics concerned with properties of space such as the distance, shape, size, and relative position of figures. Geometry is, along with arithmetic, one of the oldest branches of mathematics. A mathematician w ...
.
The software is
Java
Java is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea (a part of Pacific Ocean) to the north. With a population of 156.9 million people (including Madura) in mid 2024, proje ...
based.
The author is René Grothmann of the
Catholic University of Eichstätt-Ingolstadt
The Katholische Universität Eichstätt-Ingolstadt (KU) is a Catholic research university in Eichstätt and Ingolstadt, Bavaria, Germany. It is the only Catholic university in Germany.
Compared to other German universities it is a rather small ...
.
It is licensed under the terms of the
GNU General Public License
The GNU General Public Licenses (GNU GPL or simply GPL) are a series of widely used free software licenses, or ''copyleft'' licenses, that guarantee end users the freedom to run, study, share, or modify the software. The GPL was the first ...
(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
Java applets were small applications written in the Java programming language, or another programming language that compiles to Java bytecode, and delivered to users in the form of Java bytecode.
At the time of their introduction, the i ...
.
(Previously, they could be run in a browser, but Java support in browsers has been disabled in recent years.)
See also
*
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 a ...
*
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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