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A standard ruler's actual size is 12 inches long. Rulers may be plastic, metal or wooden. Often rulers have metric measurements on one side even though the metric system is not used in the United States, at least not for official purposes.
three size
12 inches, which is 1 foot which is the size of a ruler.
If a diagram is smaller than actual size it is called a reduction.
because 1 foot is the size of a ruler and there are 12 inches in 1 ruler