fol 20v, figures I.43. et I.44 en bas de page

British Library
Oriental Manuscripts, Delhi Arabic 1909

Taḥrīr uṣūl al-handasah wa-al-ḥisāb
version of Naṣīr al-Dīn Muḥammad ibn Muḥammad al-Ṭūsī نصير الدين محمد بن محمد الطوسي
completed on 4 November 1799 by Rukn al-Dīn ركن الدين

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