...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」
...The lancet, the equilateral, and the obtuse-angled arch...
Matthew Holbeche Bloxam 「The Principles of Gothic Ecclesiastical Architecture, Elucidated by Question and Answer, 4th ed.」
...The design of the tracery in the rose window is in twoorders, based upon equilateral triangles filled in with cusps...
Hubert C. Corlette 「Bell's Cathedrals: Chichester (1901)」
...Betelgeuze, in Orion, Procyon, in Canis Minor, and Sirius form anearly equilateral triangle...
William Tyler Olcott 「A Field Book of the Stars」
...There is a fine equilateral triangle, whereof Arcturus and Spica formtwo of the corners, while the third is indicated by Denebola, the brightstar near the tail of the Lion (Fig...
Robert Stawell Ball 「The Story of the Heavens」
...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」
...If you inscribe in acircle a large number of equilateral triangles, they envelop anothercircle bearing a definite ratio to the first: these might do for theorbits of two planets ()...
Oliver Lodge 「Pioneers of Science」
...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」
...α forms an equilateral triangle with Polaris and ε Cassiopeiæ...
William Tyler Olcott 「A Field Book of the Stars」
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