... The shape of the triangular extremity of the lateral processes differs considerably, being either almost equilateral or much elongated... 
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...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」
...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」
...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」
...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」
..., the new star is in linewith two already on the drawing and is midway betweenthem, or it makes an equilateral triangle with two others,or a square with three others, etc...
George C. Comstock 「A Text-Book of Astronomy」
...The star αCapricorni is plainly double, and asharp eye can detect that one of the faint stars which withVega make a small equilateral triangle, is also a doublestar...
George C. Comstock 「A Text-Book of Astronomy」
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