www.merriam-webster.com/dictionary/triangle

Triangle definition is - a polygon having three sides. How to use triangle in a sentence.

www.dictionary.com/browse/triangle

Triangle definition, a closed plane figure having three sides and three angles. See more.

www.thefreedictionary.com/triangle

Define triangle. triangle synonyms, triangle pronunciation, triangle translation, English dictionary definition of triangle. triangle top: right triangle bottom: equilateral triangle n. 1. a. The plane figure formed by connecting three points not in a straight line by straight...

www.mathsisfun.com/definitions/triangle.html

Illustrated definition of Triangle: A 3-sided flat shape with straight sides. It is a polygon.

en.wikipedia.org/wiki/Triangle

A triangle with all interior angles measuring less than 90° is an acute triangle or acute-angled triangle. If c is the length of the longest side, then a 2 + b 2 > c 2, where a and b are the lengths of the other sides. A triangle with one interior angle measuring more than 90° is an obtuse triangle or obtuse-angled triangle.

mathopenref.com/triangle.html

Definition and properties of triangles. Vertex: The vertex (plural: vertices) is a corner of the triangle. Every triangle has three vertices. Base: The base of a triangle can be any one of the three sides, usually the one drawn at the bottom. You can pick any side you like to be the base.

www.splashlearn.com/math-vocabulary/geometry/triangle

Definition of Triangle explained with real life illustrated examples. Also learn the facts to easily understand math glossary with fun math worksheet online at SplashLearn. SplashLearn is an award winning math learning program used by more than 30 Million kids for fun math practice. It includes unlimited math lessons on number counting ...

www.geom.uiuc.edu/~wanous/definitionofatriangle.html

A triangle is a closed figure with three sides.. Use this definiton to figure out which of the following shapes are triangles and which are not. Click here to check your answers.. Can you think of any triangles that you see in your everyday life?

www.merriam-webster.com/dictionary/isosceles triangle

Isosceles triangle definition is - a triangle in which two sides have the same length.

www.mathsisfun.com/triangle

Imagine you "doubled" the triangle (flip it around one of the upper edges) to make a square-like shape (a parallelogram) which can be changed to a simple rectangle: THEN the whole area is bh, which is for both triangles, so just one is ½ × bh.