There are no everyday examples, for a line is infinitely long/thin. However, there are many common objects that are line segments, like a straight string or wire.
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If it is a horizontal straight line, it means the object is moving at constant velocity. If it is a sloped line, it means the object is accelerating.
a line used to mark the outside of an object
A symmetrical object is an object that can be cut into two so that one side is the mirror image of the other. An example would be a circle cut by a vertical line into two semi-circles.
it is a heavy line that defines the shape and size of an object in a blueprint
A pin head.