It has 3 sides
It has 3 exterior angles that add up to 360 degrees
It has 3 interior angles that add up to 180 degrees
It has a perimeter which is the sum of its 3 sides
It has an area which is: 0.5*base*perpendicular height
It has no diagonals
It will tessellate
It can be a scalene triangle having 3 different acute angles
It can be an obtuse triangle having 1 obtuse angle and 2 different acute angle
It can be a right angle triangle having a 90 degree angle and 2 acute angles
It can be an isosceles triangle having 2 equal sides and 2 equal acute angles
It can be an equilateral triangle having 3 equal sides and 3 equal 60 degree angles
It is subject to the rules of trigonometry
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