Heron Alexandrinus
,
Belopoiica
,
1918
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αἱ μέσαι ἀνὰ λόγον εἰσὶν αἱ ΑΖ, ΓΗ·
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καὶ πρώτης οὔσης τῆς ΑΒ, δευ
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τέρα μὲν ἔσται ἡ ΑΖ, τρίτη δὲ
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ἡ ΓΗ, τετάρτη δὲ ἡ ΒΓ. </
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<
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γὰρ διαγώνιόν ἐστιν τὸ ΑΒΓΔ
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παραλληλόγραμμον, αἱ τέσσαρες
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εὐθεῖαι αἱ ΔΕ, ΕΑ, ΕΒ, ΕΓ ἴσαι
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ἀλλήλαις εἰσίν]2· ἐπεὶ γὰρ ἴση ἐστὶν
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ἡ ΑΕ τῇ ΕΔ καὶ διῆκται ἡ
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ΕΖ, τὸ ἄρα ὑπὸ ΔΖΑ μετὰ τοῦ
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[2ἀπὸ]2 ΑΕ ἴσον ἐστὶν τῷ ἀπὸ τοῦ
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ΕΖ. </
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ΔΗΓ μετὰ τοῦ ἀπὸ ΓΕ ἴσον
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ἐστὶν τῷ ἀπὸ ΕΗ· καὶ ἔστιν ἴση
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ἡ μὲν ΑΕ τῇ ΕΓ, ἡ δὲ ΕΖ τῇ
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ΕΗ. </
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ἴσον τῷ ὑπὸ ΔΗΓ. </
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<
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ΗΔ πρὸς ΔΖ, οὕτως ἔστιν ἡ
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ΑΖ πρὸς ΓΗ. </
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πρὸς ΔΖ, ἥτε ΑΒ πρὸς ΑΖ, καὶ
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ἡ ΖΑ πρὸς ΓΗ, καὶ ἡ ΗΓ πρὸς
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ΓΒ· ἔσται ἄρα καὶ ὡς ἡ ΒΑ
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πρὸς ΑΖ, οὕτως καὶ ἡ ΗΓ πρὸς
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ΓΒ· τῶν ἄρα ΑΒ, ΒΓ δύο μέσαι
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ἀνὰ λόγον εἰσὶν αἱ ΑΖ, ΓΗ.
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