PAL

Ptolemaeus Arabus et Latinus

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leur situation lorsqu'elles sont faites dans l'une des surfaces ‘spatial ratios’

French

References: PH Morelon: I.2:1, 16:18-19
Translation of:
Arabic: حالها إذا قيست بسطح من السطوح [PH Morelon: I.2:1, 17:10-11]