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*2a : 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
*2a : 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
:b : 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
:b : 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
*3: a situation in which one member of a couple is involved in a [[Romance|love affair]] with a third person
*3: a situation in which one member of a couple is involved in a [[Romance|love affair]] with a third person
<center>For lessons on the related [[topic]] of '''''Triunity''''', follow [http://nordan.daynal.org/wiki/index.php?title=Category:Triunity '''''this link'''''].</center>
==Description==
==Description==
A '''triangle''' is one of the basic shapes of [[geometry]]: a [http://en.wikipedia.org/wiki/Polygon polygon] with [[three]] corners or vertices and three sides or edges which are line segments. A triangle with vertices A, B, and C is denoted [[File:Triangle.jpg]].
A '''triangle''' is one of the basic shapes of [[geometry]]: a [http://en.wikipedia.org/wiki/Polygon polygon] with [[three]] corners or vertices and three sides or edges which are line segments. A triangle with vertices A, B, and C is denoted [[File:Triangle.jpg]].