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


figure IV.1


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figure IV.2


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figure IV.3


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


figure IV.4


α          ©          Σ