Mensuration - Triangle

A triangle or trigon is a two dimensional geometric object that has the specific qualities of having three straight sides that intersect at three vertices. The sum of the internal angles that exist at the vertices... A triangle or trigon is a two dimensional geometric object that has the specific qualities of having three straight sides that intersect at three vertices. The sum of the internal angles that exist at the vertices always total the same number for every triangle—180 degrees, or π radians.
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