Interactive Geometry

The following Java applets were generated using C.a.R.; some of them are equivalent to the exercises in Euclidea — a cool collection of interactive geometric puzzles.

Since in all major browsers the support for Java plugins has ended, we recommend installing Java Developers Kit (JDK 8) (or OpenJDK 8) and open the exercises using the command appletviewer url... For example, to open the first exercise you use the following command:

appletviewer http://anton-petrunin.github.io/birkhoff/car/Angle%20bisector.html

On Windows, before executing the command, you may need to navigate to the folder with appletviewer, it should be something like C:\Program Files\Java\jdk1.8.0\bin

If your computer has a more recent JDK, you might need to force it to use the older JDK by entering export JAVA_HOME=$(/usr/libexec/java_home -v 1.8) (or something like that) before executing appletviewer.