Mathematical teaching aid

The seven shapes for the teaching aid are cut from a basic square by linking the mid points (M1,M2) of two opposite sides with opposite corners (A,C) and by taking the orthogonal cuts from these lines to the other corners (D,B). The cuts leave a small square (IV) in the centre and two identical trap...

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Bibliographische Detailangaben
1. Verfasser:	SCHUETZ, KLAUS HENNING, 51429 BERGISCH GLADBACH, DE
Format:	Patent
Sprache:	eng ; ger
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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Beschreibung
Zusammenfassung:	The seven shapes for the teaching aid are cut from a basic square by linking the mid points (M1,M2) of two opposite sides with opposite corners (A,C) and by taking the orthogonal cuts from these lines to the other corners (D,B). The cuts leave a small square (IV) in the centre and two identical trapeziums (III) as well as two pairs of right angled triangles (I and II) with the dimensions of one triangle (II) twice that of the other (I).The square and the trapeziums can be made up of triangles similar to the smaller triangle. The shapes can be assembled into different combinations representing different mathematical problems. They can be cut from wood or plastics and can be assembled with simple fastenings.