a ruler is used to measure inches or 1 foot
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A ruler.
a ruler is used to measure it and cm, sometimes inches to
The foot ruler term came about from the measure used on a ruler which is exactly twelve inches long. A foot is a standard measure therefore came the foot ruler to represent one unit of measurement.
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.
the aleks ruler can measure what ever it wants, including centimeters, because it is the ruler.