Heron Alexandrinus
,
Mechanicorum Fragmenta
,
1899
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δέ, φησίν, τῶν δείξεων τὴν μάλιστα πρὸς τὴν χειρουρ
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γίαν εὔθετον.
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<
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">Ἔστωσαν γὰρ αἱ δοθεῖσαι εὐθεῖαι αἱ ΑΒ, ΒΓ
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πρὸς ὀρθὰς ἀλλήλαις κείμεναι, ὧν δεῖ δύο μέσας ἀνά
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λογον εὑρεῖν.
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">Συμπεπληρώσθω τὸ ΑΒΓΔ παραλληλόγραμμον,
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καὶ ἐκβεβλήσθωσαν αἱ ΔΓ, ΔΑ, καὶ ἐπεζεύχθωσαν αἱ
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ΔΒ, ΓΑ, καὶ παρακείσθω κανόνιον πρὸς τῷ Β ση
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μείῳ καὶ κινείσθω τέμνον τὰς ΓΕ, ΑΖ, ἄχρις οὗ ἡ
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ἀπὸ τοῦ Η [2ἀχθεῖσα]2 ἐπὶ τὴν τῆς ΓΕ τομὴν ἴση
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γένηται τῇ ἀπὸ τοῦ Η ἐπὶ τὴν τῆς ΑΖ τομήν. </
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νέτω, καὶ ἔστω ἡ μὲν τοῦ κανονίου θέσις ἡ ΕΒΖ,
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ἴσαι δὲ αἱ ΕΗ, ΗΖ. </
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ἀνάλογόν εἰσιν τῶν ΑΒ, ΒΓ.
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