Non-intersecting lines in 3-D space may be parallel but need not be.
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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.
A nonagon is a nine-sided polygon. In a nonagon, there are four pairs of parallel lines. This is because the nonagon can be divided into three sets of parallel lines, each containing three parallel lines. Each set of parallel lines consists of three pairs of parallel lines.
concurrent
It has no paralel lines. A paralel line are two lines that never cross. If you notice, in a trinagle all lines are touching all other lines.
its the point of concurrency