...Returning to the single encircling band, it is found, in ,broken up into alternating equilateral triangles, each pair united attheir right angles... 
Jesse Walter Fewkes 「Archeological Expedition to Arizona in 1895」
...The lancet arch is seldom seen; the equilateral arch is generally,though not always, used...
Matthew Holbeche Bloxam 「The Principles of Gothic Ecclesiastical Architecture, Elucidated by Question and Answer, 4th ed.」
...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」
...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」
...The six bright stars in Lyra form an equilateral triangle on onecorner of a rhomboid...
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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