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.
For more information about the topic Triangle, read the full article at Wikipedia.org, or see the following related articles:
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