Dublin, Chester Beatty Library
Ar 3424
Revision of Euclid's Elements
by Athir al-Din al-Mufaddal ibn `Umar al-Abhari


figure IV.14


α          ©          Σ

Dublin, Chester Beatty Library
Ar 3424
Revision of Euclid's Elements
by Athir al-Din al-Mufaddal ibn `Umar al-Abhari


figure IV.15


α          ©          Σ