Any old Meter ruler should be fine, 36 inches is about 93 centimetres, just subtract the difference.
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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.
6 inches is half of a foot. A ruler is 1 foot so 6 inches is half of a ruler
because 1 foot is the size of a ruler and there are 12 inches in 1 ruler
It was supposedly the foot size of Hercules
ruler