Castle del Monte - central building and towers
This applet is a companion to a paper (in Hebrew) by Hershkovitz and Dana-Picard (2020), about regular octagons and concrete applications.
Th. Dana-Picard and S. Hershkovitz: Exploration of octagons in a technology-rich environment: an example of integration of different domains of knowledge for mathematics learning (in Hebrew), Mispar Chazak 31, Haifa, Israel, 2020, 68-77.