**2016.1 - c **

(EN) A mathematics teacher of Chinon, Mrs Françoise Jacot did describe in her words the construction process for our octagonal formula. it's a great job already.

(FR) Un professeur de mathématiques de Chinon, Madame Françoise Jacot a fait de décrire avec ses mots le procédé de construction du bras octogonal pour notre formule de l'octogonal. c'est un déja grand travail.

PDF file : http://varipon.com/Procede_de_construction_du_bras_octogonal.pdf

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**2016.1 - e**

Our octagonal formula now is alive and very happy with the math teacher. She explains that this is similar with the Cardoid curve. https://en.wikipedia.org/wiki/Cardioid