It is possible, but you need to use three axes.
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Impossible to change a volume measure to a length measure
It is impossible to measure a line because a line has no beginning or end point. You can only measure a line sector. A ray has a beginning point, however, but goes on in one direction endlessly.
This is an impossible question to answer as litres and metres are not compatible measurements. You can measure litres in square metres.
It is extremely difficult to explain how since it is, in fact, impossible!
You are apparently referring to the Cartesian system of assigning x, y, and z coordinates to map out the relationship of objects in space. a point has to occur somewhere - and to define its location in two dimensions (like in a floor plan) you need to provide an x and a y dimension. If you want to describe the location of a point in three dimensional space you also need to provide a height above the ground - the z coordinate. A line is simply the direct path between two points in space. Thus, to draw a line you need two points. If you are asking how to measure these with a ruler, a point has no dimension. A line has only 1 dimension.