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Place the ruler side by side with the object. One of the edges of the object should be in the "0" value of the ruler. Then just see where the other edge is and there you have it.
Get a ruler and measure one at a time not all at once
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 used to measure inches or 1 foot
the aleks ruler can measure what ever it wants, including centimeters, because it is the ruler.