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A ruler is usually graduated so that it can be used to measure lengths. A straight edge is just that: it has no marking to help you measure lengths.
Square units are used to measure the area of something.
You measure the length of two objects, then you divide the lengths.You measure the length of two objects, then you divide the lengths.You measure the length of two objects, then you divide the lengths.You measure the length of two objects, then you divide the lengths.
Lengths - in units that are marked on the tape measure.
You measure them.