Handkerchief Mouse https://www.mathematische-basteleien.de/handkerchiefmouse.htm
You may have to pull on these points to loosen them. It must look like this.
Dein Suchergebnis zum Thema: have
Triangular Numbers https://www.mathematische-basteleien.de/triangularnumber.htm
You can arrange them to n(n+1)/2 pairs. n+1 horizontal lines also have n(n+1)/2 pairs
Paper Basket https://www.mathematische-basteleien.de/basket.htm
(If you have no practise, you should pre-fold by several halvings.) 10 …
Domino Puzzles https://www.mathematische-basteleien.de/dominos.htm
These are the squares, which the dominos have.
Paper Banger https://www.mathematische-basteleien.de/banger.htm
You have a similar sound if you clap your hands once. ……
Homepage 1999 – how it started https://www.mathematische-basteleien.de/homepage1999e.htm
A colleague suggested: "Think of newspapers, they have narrow columns for better
Fünfstrahlige Figuren https://www.mathematische-basteleien.de/fuenfstrahlig.htm
Links ein Beispiel Kepler-Poinsot-Körper "All four (Kepler-Poinsot Polyhedra) have
Flexatube https://www.mathematische-basteleien.de/flexatubes.htm
There is also a bag on the reverse side, but the colours have changed.
Spirograph https://www.mathematische-basteleien.de/spirographs.htm
In the end you have to use both trigonometric formulas. Result: ……