Reference Article

from Wikipedia, the free encyclopedia

Triangle

A triangle is one of the basic shapes of geometry: a polygon with three vertices and three sides which are straight line segments.

Any three non-collinear points determine a triangle and a unique plane, i.e. two dimensional Cartesian space in Euclidean geometry.

From the systemics perspective, triangle is the structure of every system composed with three reciprocally connected/interrelated abstract or real objects.

Note: This article excerpts material from the Wikipedia article "Triangle", which is released under the GNU Free Documentation License.

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