![]() 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) .(next): Entry: triangle (Euclidean geometry) Discribes a person that speaks out of the side of their mouth forming a triangle shape. The word skeleton comes from the same linguistic root. It is pronounced eye- sos-ell-eez, that is, with the emphasis on the second syllable. Thus an isosceles triangle is literally an equal-leg triangle. ![]() The word isosceles comes from the Greek: $\iota \sigma \omicron \sigma \kappa \epsilon \lambda \epsilon \varsigma$, that is: from iso meaning equal, and skelos meaning leg.
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