What is a cyclic square 1

The house of the quadrangles as seen from the Heidelberg Winkelkreuz

Geometry between Basic Concepts and Basic Concepts pp 155-177 | Cite as

  • Michael Gieding
First Online:


The Heidelberg angle cross is a tool for the active investigation of geometric figures. It consists of two wooden strips that are rotatably connected to one another in the middle. There are pins at equidistant intervals on the wooden strips. By means of a rubber, representatives of geometric figures can be stretched on the Heidelberg angle cross. The article shows how the observation of convex squares is systematized by means of the Heidelberg angle cross and why and how such studies can be integrated into mathematics lessons in general schools.

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Copyright information

© Springer Fachmedien Wiesbaden 2015

Authors and Affiliations

  1. 1. Fac. III Subject Mathematics Heidelberg University of EducationHeidelbergGermany