This book, “Treatise on the Angle” by Kamal al-Dīn al-Fārisī belongs to the realm of mathematical educational science, representing one of the key specialist sciences in which scholars have demonstrated untrammeled creativity in making original contributions and inventing novel branches in this discipline that was unheard of in past civilisations. “A Treatise on the Angle” is one of a rare breed of books in our heritage, as it addresses a topic related to the discipline of mathematics history and philosophy, on the one hand, and on the other, is a study of the nature of the angle – a philosophical mathematical concept – from the perspective of Arab scholars. The importance of the topic stems from the necessity to study the essence of mathematical concepts so as to complete our knowledge of mathematics, and because it was not previously subject to detailed study in ancient Greek civilisation. This substantiates the keen interest that Arab and Muslim scholars had in the theoretical and intellectual aspects, alongside their interest in the applied aspects of the sciences, in their works, which were endowed with originality as a result.
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