It depends on what information you do have.
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You find the midpoint of a line segment by dividing its length by two. If you are given two sets of 'x' and 'y' coordinates as the endpoints of the segment on a graph, then you need to use the formula [X1 plus X2]/2, [Y1 plus Y2]/2 to find the coordinates of the midpoint.
One characteristic of a line is that the length continues on forever.You can only find the length of a line segment.
The formula "length x width x height" is a general formula to find VOLUME?
You measure it.
The midpoint formula is used to find the point that is in the middle of a segment.