The Banū Mūsā: The Measurement of Plane and Solid Figures ( ~ 850)
For example, let there be two different circles, the circles ABG, DEG [see Fig. 38]. Let their diameters be BG, the diameter of circle ABG, and EZ, the diameter of circle DEZ. I say, therefore, that
diameter BG/circum ABG = diameter EZ/circum DEZ, which is demonstrated as follows:
KeywordsTrue Ratio Area Circle Arabic Text Arabic Manuscript
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