fol 31,
figure II.5
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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