The Extant Greek Works of Apollonius of Perga, Vol. I

quae figurarum series ad p. 296, 17 sq. pertinet, sed tam mutila est, ut difficile sit dictu, quo modo ordinanda sit. nam in V sola secunda series rectangulorum exstat, quorum unum litteris caret; reliqua e v petita sunt. omnia ordine decurrent, si quattuor illae rectae primo loco ponentur et pro duobus quadratis litteris carentibus describentur hae rectae

Four groups of vertical line segments labeled with Greek letters. The first group contains lines δ-ε, χ-ε, and ε-γ. The second group contains η-ϑ, κ-ϑ, and ζ-ϑ. After the word 'or', there are two smaller groups containing δ-ε, χ-ε and η-ϑ, κ-ϑ respectively.

tum enim habebimus: quoniam $χ\varepsilon : γ\varepsilon = \varkappa\vartheta : \varthetaζ$, erit $χ\varepsilon^2 : \varepsilonγ^2 : χ\varepsilon \times \varepsilonδ = \varkappa\vartheta^2 : \varthetaζ^2 : \varkappa\vartheta \times \varthetaη$; quare $δ\varepsilon : χ\varepsilon : \varepsilonγ = η\vartheta : \varkappa\vartheta : ζ\vartheta$ (uel $δ\varepsilon : χ\varepsilon = η\vartheta : \varkappa\vartheta$).

Ad II, 51:

Four vertical line segments labeled ε-η, η-γ, ζ-λ, and κ-λ. Below them are four rectangles representing geometric areas, with corner labels ε, η, δ; η, γ, η; ζ, λ, ϑ; and κ, λ, κ.

haec Vv, nisi quod V in $ζλ$ pro $λ$ habet $\varkappa$. praeterea in vc post quattuor rectas adduntur hae (in $λ\vartheta$ littera $\vartheta$ in solo c seruata est).

Four vertical line segments labeled η-δ, η-γ, λ-ϑ, and κ-λ.

has rectas si cum Zeuthenio ultimo loco ponemus, habebimus
$\varepsilonη : ηγ = ζλ : \varkappaλ$ et $\varepsilonη \times ηδ : ηγ^2 = ζλ \times λ\vartheta : \varkappaλ^2$;