![]() 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) .2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) .1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) .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. Results about isosceles triangles can be found here.( The Elements: Book $\text$: Definition $20$) Of trilateral figures, an equilateral triangle is that which has its three sides equal, an isosceles triangle that which has two of its sides alone equal, and a scalene triangle that which has its three sides unequal. Definition 2 If l is any line and A an external point, the foot of A on l is a. In the above diagram, $AB$ and $AC$ are the legs. Corollary C If the legs of an isosceles triangle each have length /2. The sides of an isosceles triangle which are adjacent to the apex are called the legs of the triangle. The vertex opposite the base of an isosceles triangle is called the apex of the triangle. ![]() In the above diagram, $\angle ABC$ and $\angle ACB$ are the base angles. The two (equal) vertices adjacent to the base of an isosceles triangle are called the base angles. The base of an isosceles triangle is specifically defined to be the side which is a different length from the other two. ![]() An isosceles triangle is a triangle in which two sides are the same length. ![]()
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