eukleides software package provides Euclidean geometry drawing language, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install eukleides
eukleides is installed in your system.
Make ensure the eukleides package were installed using the commands given below,
$ sudo dpkg-query -l | grep eukleides *
You will get with eukleides package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Mathematics |
| Package | eukleides |
| Version | 1.5.4-4+b1 |
| Description | Euclidean geometry drawing language |
| Sub Section | Math |