Ammonius, In Aristotelis Categorias Commentarius, ed. Adolf Busse, 1.5.23

τρίγωνον δὲ καὶ τετράγωνον.

οὐδὲ γὰρ τρίγωνον τριγώνου μᾶλλον καὶ ἧττόν ἐστι τρίγωνον οὐδὲ
τὸ πεντάγωνον τοῦ τετραγώνου μᾶλλον κύκλος ἐστί· δεῖ γὰρ εἰ μέλλοιεν ὡς κύκλοι συγκρίνεσθαι ἀμφότερα ἐπιδέχεσθαι τὸν τοῦ κύκλου λόγον. εἰ δ’ οὐκ ἐπιδέχονται, οὐδὲ συγκρίνεσθαι τὴν ἀρχὴν δυνήσονται. οὐδὲ γὰρ εἴποι τις τὸν βοῦν μᾶλλον τοῦ ἵππου εἶναι ἄνθρωπον, ἐπεὶ μηδέτερος αὐτῶν τὸν τοῦ ἀνθρώπου ὁρισμὸν ἐπιδέχεται. οὐκοῦν καὶ ἐπὶ τῶν σχημάτων
ὡσαύτως· πάντα γὰρ τὰ σχήματα τὰ ἐπιδεχόμενα τὸν τοῦ κύλλου ὁρισμὸν ὁμοίως κύκλοι εἰσί, καὶ ὅσα τὸν τοῦ τριγώνου ὁρισμὸν ἐπιδέχεται, ὁμοίως τρίγωνά εἰσι, καὶ ἐπὶ τῶν ἄλλων ὡσαύτως.

Ammonius In Aristotelis Categorias Commentarius 1.5.23

ed. Adolf Busse

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