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

Gespeichert in:

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
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	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 with a supporting column on the base plate, the supporting column is connected with a flexible cord, the cord is clamped in the gap of one circular ring in a state of tensioning, the cord is wound on the outer side surface of the circular ring for one circle, the length of the segment of the cord, from the supporting column to the outer side surface of the circular ring and the radius of the supporting column are measured, the sum the length and the radius is the radius of the circular ring, the length of one circle of the cord on the outer side surface of the cord is measured, the length is the circumference of the circular ring, and further the Pi can be calculated. Another circular ring can be measured by using