...His rays diverge through the firmament instraight lines as though forming an equilateral triangle, that is, tothe fifth sign from the sun, no more, no less... 
Vitruvius 「Ten Books on Architecture」
...Above the tail of the Lesser Bearare the feet of Cepheus, and at this point, at the very top, are starsforming an equilateral triangle...
Vitruvius 「Ten Books on Architecture」
...How is the equilateral arch formed and described?...
Matthew Holbeche Bloxam 「The Principles of Gothic Ecclesiastical Architecture, Elucidated by Question and Answer, 4th ed.」
...Let us next turn to the third star of the equilateral triangle mentionedabove—viz...
Richard A. Proctor 「Half-hours with the Telescope」
...It is the samedistance northwest of Spica, in Virgo, and forms with Spica andArcturus a large equilateral triangle...
William Tyler Olcott 「A Field Book of the Stars」
...It is distinguished by itsforming an equilateral triangle with α and γ, stars of the samemagnitude 6° south and east of it...
William Tyler Olcott 「A Field Book of the Stars」
...Betelgeuze, in Orion, Procyon, in Canis Minor, and Sirius form anearly equilateral triangle...
William Tyler Olcott 「A Field Book of the Stars」
...Thestar is easily identified, since it lies to the left of Vega, formingwith ζ a small equilateral triangle...
Richard A. Proctor 「Half-hours with the Telescope」
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