A triangle is formed by three straight lines and has three interior angles that add up to 180 degrees.
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It is a triangle similar to the original but quarter the size.
Exterior
triangle * * * * * What? Two lines can make an angle, but how can they make a triangle?
A triangle has by definition three intersecting sides. If two of the sides are parallel, they will never intersect, so no triangle can ever be formed.
hexagon