isosceles triangle

noun

Definition of isosceles triangle

mathematics
:a triangle in which two sides have the same length

Word by Word Definitions

isosceles play
  1. : having two equal sides — see triangle illustration

  2. : having the two nonparallel sides equal

triangle play
  1. : a polygon having three sides — compare spherical triangle

  2. : a percussion instrument consisting of a rod of steel bent into the form of a triangle open at one angle and sounded by striking with a small metal rod

  3. : a drafting instrument consisting of a thin flat right-angled triangle of wood or plastic with acute angles of 45 degrees or of 30 degrees and 60 degrees


ISOSCELES TRIANGLE Defined for Kids

isosceles triangle

noun isos·ce·les triangle \ ī-ˈsä-sə-ˌlēz- \

Definition of isosceles triangle for Students

:a triangle having two sides of equal length

Seen and Heard

What made you want to look up isosceles triangle? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

a ram's-horn trumpet used in Judaism

Get Word of the Day daily email!

Test Your Vocabulary

Merriam-Webster's New Words Quiz—Fall 2017 Edition!

  • young-plant-shoots
  • Which of the following is a new sense of the word bunny?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!