Primary school mathematics Pi demonstration device

The utility model relates to a primary school mathematics Pi demonstration device, wherein a base plate is fixedly provided with one or more concentric circular rings with different diameters, each circular ring is provided with a gap, the common center of all the circular rings is fixedly provided...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	ZHANG RUNXIAN, ZHANG QISHI
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ADVERTISING APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND,DEAF OR MUTE CRYPTOGRAPHY DIAGRAMS DISPLAY EDUCATION EDUCATIONAL OR DEMONSTRATION APPLIANCES GLOBES PHYSICS PLANETARIA SEALS
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