isosceles triangle

Noun

 * 1)  A triangle having at least two sides equal.

Usage notes
In original usage, an isosceles triangle was understood to have the third side unequal to the other two, that is, an isosceles triangle has exactly two equal sides. An equilateral triangle is, however, a special case of an isosceles triangle, having all three sided equal.


 * c 300  Euclid Elements, Book I, Definition 20, English translation,
 * 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. (Τῶν δὲ τριπλεύρων σχημάτων ἰσόπλευρον μὲν τρίγωνόν ἐστι τὸ τὰς τρεῖς ἴσας ἔχον πλευράς, ἰσοσκελὲς δὲ τὸ τὰς δύο μόνας ἴσας ἔχον πλευράς, σκαληνὸν δὲ τὸ τὰς τρεῖς ἀνίσους ἔχον πλευράς.)
 * 1570 Billingsley, Euclid Book 1, Definition xxv,
 * Isosceles is a triangle, which hath onely two sides equall.
 * Isosceles is a triangle, which hath onely two sides equall.

Translations

 * Chinese:
 * Mandarin:
 * Dutch: gelijkbenige driehoek
 * Finnish:
 * French: triangle isocèle
 * German: gleichschenkliges Dreieck
 * Hungarian:
 * Icelandic: jafnarma þríhyrningur
 * Irish: triantán comhchosach
 * Italian: triangolo isoscele
 * Japanese:
 * Korean:
 * Malay: segitiga kakisama
 * Moore: yɩɩb-taas kog-tãabga
 * Polish:
 * Portuguese: triângulo isósceles
 * Russian:
 * Tagalog: kaduhaing tatsiha
 * Thai: สามเหลี่ยมหน้าจั่ว
 * Turkish:
 * Vietnamese:
 * Welsh: triongl isosgeles