: a triangle in which all three sides are the same length
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Consider the symmetries of the equilateral triangle.—Leila Sloman, Quanta Magazine, 3 Dec. 2025 Few people today, however, likely know what the letters YMCA stand for, much less what the familiar red equilateral triangle represents.—Richard Selcer, Fort Worth Star-Telegram, 15 Nov. 2025 Each section is an equilateral triangle — each side the same length.—Kurt Snibbe, Oc Register, 28 Oct. 2025 Each of these numbers have been made proportional to the area of an equilateral triangle, the sides of which are calculated using a simple formula.—Vipin Bharathan, Forbes.com, 13 Sep. 2025 This equilateral triangle connects three brilliant stars — Arcturus in Boötes, Spica in Virgo and Denebola in Leo, all of them fixtures of the spring night sky in the Northern Hemisphere.—Jamie Carter, Forbes, 17 Mar. 2025 But constructing our perfectly symmetric equilateral triangle—a regular polygon—required some elegant legwork.—Jack Murtagh, Scientific American, 12 Sep. 2024 The arrangement of this array mimics the fractal known as the Sierpiński gasket, which has the overall shape of an equilateral triangle divided into smaller identical triangles as well as triangular holes.—IEEE Spectrum, 4 Aug. 2020