An Archimedean Proposition Presented by the Brothers Banū Mūsā and Recovered in the Kitāb al-Istikmāl (eleventh century)

Archimedes developed a geometrical method to obtain an approximation to the value of π , that appears in the encyclopaedic work of the prince al-Mu’taman ibn Hūd in the eleventh century. This article gives the edition, translation and transcription of this Archimedean proposition in his work, together with some comments about how other medieval authors dealt with the same proposition.