This question does not ask the user to provide me a full MWE, but simply to obtain any information step by step as to create different circular sectors.
This image is taken from the site: https://www.inrim.it/sites/default/files/mediaroot/eventi/logo_nuovosi.png
I have read the only the manual
pgf-pie to build pie charts and with lot of sincerity I have seen the responses of users and I have been so scared (see here: Multi-layer Donut Pie).
In fact, I was wondering if you need very much code to make a frontal one that is not in 3D.
I would like to make it because I absolutely don't like some symbols like
$\Delta v$ and
So I only ask users for the simplest steps and no complete MWE.
Thank you (excuse me very much for not having added the link of the image and I have not specified that it serves only me and will not be published, or used improperly).