a point
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It is the parallel lines in Geometry!
POINT- it has no lenght, no width and no thickness LINE- it has a lenght but no width and thickness. A line in geometry will always mean a straight line, which extends indifinitely in two opposites directions.. PLANE- it is a flat surface in which any two points are joined by a straight line lying entirely on the surface..
Yes
A point has no length or width.
If the bar is a three dimensional object it will have some thickness. Then, assuming it is oblong in shape and knowing its length, width and thickness: Surface_area = 2 x (length x width + width x thickness + thickness x length)