This article is dedicated to the 1040th anniversary of the birth of the great scientist of Central Asia named Avicenna (Abu Ali Ibn Sina). The authors begin information about how Avicenna received knowledge from his mentors in childhood and clarify mathematical materials issued from books called "The Book of Knowledge" and "The Book of Healing", which are of great importance among the scientific works of the scientist. These works describe the tasks of squaring numbers and their division, as well as information regarding elementary geometry, which must be given in sequential order. Along with this, it is said that Avicenna was also engaged in the proof of the fifth postulate of Euclid.
arithmetic, geometry, straight line, plane, perpendicular, Euclidean geometry, book of knowledge, book of healing, proportion, postulate, axiom, square, cube, remainder
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