They can be parts of lines.
They have one unit of measure.
They connect two endpoints.
They can "grow" to become two-dimensional objects.
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D - All of the Above
That seems to be true. Sides pretty much are line segments, and the angles are the end points.
Not enough information has been given but if a given line bisects another line at 90 degrees then it is the perpendicular bisector of that line.
The line segments will have been rotated by 180 degrees.
Imperialism destoryed local traditions.