1. Book of Abū al-Ḥasan Thābit ibn Qurra to Ibn Wahb on the Means of Arriving at Determining the Construction of Geometrical Problems Kitāb Abī al-Ḥasan Thābit ibn Qurra ilā Ibn Wahb fī al-ta’attī li-istikhrāj ‘amal al-masā’il al-handasiyya
2. Book of Aḥmad ibn Muḥammad ibn ‘Abd al-Jalīl al-Sijzī to Smooth the Paths for Determining Geometrical Propositions Kitāb Aḥmad ibn Muḥammad ibn ‘Abd al-Jalīl al-Sijzī fī tashīl al-subul liistikhrāj al-ashkāl al-handasiyya
3. Letter of Aḥmad ibn Muḥammad ibn ‘Abd al-Jalīl al-Sijzī to the Physician Abū ‘Alī Naẓīf ibn Yumn on the Construction of the Acute-angled Triangle from Two Unequal Straight Lines Risālat Aḥmad ibn Muḥammad ibn ‘Abd al-Jalīl al-Sijzī ilā Abī ‘Alī Naẓīf ibn Yumn al-mutaṭabbib fī ‘amal muthallath ḥādd al-zawāyā min khaṭṭayn mustaqimayn mukhtalifatayn
4. Two Propositions of the Ancients on the Property of the Heights of an Equilateral Triangle: Pseudo-Archimedes, Aqāṭun, Menelaus