Copyright©
2017-2021
www.ferroul.fr


avec bordure

sans bordure

















Defis Ora Stelo Explications

Français   

Kate Jones has just added pieces to her site that allow you to surround the shapes you are trying to reconstruct using the polyores of La Ora Stelo.

There are 3 new parts :


Below are the dimensions :

Dimensions 1 and φ refer to the dimensions of the triangles which serve as a basis for the polyores ; remember that φ is the golden ratio (about 1.618) :





Bord 1 and Bord φ are straight edges and Bord 36° is an angle-edge.

The angles of a convex shape made using polyores can only be 36 °, 72 °, 108 ° or 144 °; these angles are obtained by using respectively 4, 3, 2 or 1 angle-edges :




To familiarize yourself with these edges and, at the same time, with the polyores, I suggest exercises.

You can also choose to go directly to the challenges (défis in french).


A few words to present these challenges ; the shapes that you will have to reconstruct using polyores have a dimension denoted by .

In her pages, Kate Jones gives 148 possible values of . Here are the top 40 values :




They are arranged in ascending order ; to get an idea, here is the materialization of the first column using straight edges :



and that of the fourth column :



Here are 3 examples :

Regular pentagon series :

We give :



For each value of , you have to build the fence (example with = φ + 1) :



Then try to fill it with polyores :



Diamond series :

We give :



Example with = 2 :



Trisocele trapezoid series :

We give :




Example with = φ :




Go to challenges