Maybe Latin preserved the short length of the epsilon (ε), or maybe it did not so that the declension became similar to Latin third declension adjectives of one ending (like felix). The Greek masculine and feminine nominative singular is ἰσοσκελής ( isoskelḗs ), while the masculine and feminine vocative singular and the neuter nominative, accusative and vocative singular are ἰσοσκελές ( isoskelés ).Third-declension one-termination adjective (Greek-type).ġIt is unknown if Classical Latin preserved (or would have preserved) the shortness of the original Greek short ending. Because angles opposite equal sides are themselves equal, an isosceles triangle has two equal angles (the ones opposite the two equal. ( geometry ) isosceles ( having equal legs ).
Īsoscelēs ( genitive īsoscelis) third-declension one-termination adjective
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. In the above diagram, $AB$ and $AC$ are the legs. 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 original usage, an isosceles triangle was understood to have the third side unequal. In the above diagram, $\angle ABC$ and $\angle ACB$ are the base angles. (geometry) A triangle having at least two sides equal. Triangle Lesson for Kids: Definition & Facts 3:06 2-D Shapes: Lesson for Kids. By definition, an acute isosceles triangle will have at least two sides (and at least two corresponding angles) that are congruent, and no angle will be. The two (equal) vertices adjacent to the base of an isosceles triangle are called the base angles. An isosceles triangle has two sides that are the same length and one side that is a different length.
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.