It depends on what information you have. You could use a ruler or tape measure.
Or, if the information is given in the foorm of the coordinates of the end points you could find the length as follows: if the coordinates of the two end points are (a,b) and (c,d) then the length is
sqrt[(a - c)2 + (b - d)2]
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One characteristic of a line is that the length continues on forever.You can only find the length of a line segment.
4
You measure it.
Use this method.
perpendicular