... 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.」
...How is the equilateral arch formed and described?...
Matthew Holbeche Bloxam 「The Principles of Gothic Ecclesiastical Architecture, Elucidated by Question and Answer, 4th ed.」
...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 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.」
...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」
...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」
...The six bright stars in Lyra form an equilateral triangle on onecorner of a rhomboid...
William Tyler Olcott 「A Field Book of the Stars」
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