Creative Prompt #139: Triangle

1911 Triangle Shirtwaist Factory fire

right triangle

Triangle of Soloman

half square triangle

pink triangle


area of a triangle

Federal Triangle



New York Times building

triangle square

basic geometric shape

Duboce Triangle, San Francisco

A social and academic fraternity.

Triangle movie

Definition: A triangle is one of the basic shapes of geometry: a polygon with three corners or vertices and three sides or edges which are line segments

quarter square triangle

musical instrument

Research Triangle (Raleigh-Durham, N.C.)

yoga – extended triangle pose

Triangle Business Journal

Definition 2: Triangles can be classified according to the relative lengths of their sides:

  • In an equilateral triangle all sides have the same length. An equilateral triangle is also a regular polygon with all angles measuring 60°.[1]
  • In an isosceles triangle, two sides are equal in length.[2][3] An isosceles triangle also has two angles of the same measure; namely, the angles opposite to the two sides of the same length; this fact is the content of the Isosceles triangle theorem. Some mathematicians define an isosceles triangle to have exactly two equal sides, whereas others define an isosceles triangle as one with at least two equal sides.[3] The latter definition would make all equilateral triangles isosceles triangles. The 45-45-90 Right Triangle, which appears in the Tetrakis square tiling, is isosceles.
  • In a scalene triangle, all sides are unequal.[4] The three angles are also all different in measure. Some (but not all) scalene triangles are also right triangles.

half square triangle

quarter square triangle

Flying Geese


Post the direct URL (link) where your drawing, doodle, artwork is posted (e.g. your blog, Flickr) in the comments area of this post. I would really like to keep all the artwork together and provide a way for others to see your work and/or your blog, and how your work relates to the other responses.

The Creative Prompt Project, also, has a Flickr group, which you can join to post your responses. Are you already a member? I created that spot so those of you without blogs and websites would have a place to post your responses. Please join and look at all of the great artwork that people have posted.

Author: Jaye

Quiltmaker who enjoys writing and frozen chocolate covered bananas.

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