Reference Terms
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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:   The above text is excerpted from the Wikipedia article "Triangle", which has been released under the GNU Free Documentation License.
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September 4, 2015

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