Cindy Build: Arithmetic in Perspective Drawings 

Since some showed interested in learning Cinderella and CindyJS, I decided to do a little series of unscripted live builds of small applications in these programs. To start, I show you how to do calculations inside of perspective drawings or photos.
Let me know in the comments if you are interested in more of this kind of videos and what kind of applications and visualisations you would want to see.
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Resources, references & further reading material:
Cinderella:
www.cinderella.de
The GitHub Repository with my Cindy builds:
github.com/Sum...
Richter-Gebert, Jürgen (2011) Perspectives in Projective Geometry, Springer.
link.springer....
The second Cinderella Build on integrals:
• Cindy Build: Riemann I...