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The old Imperial ruler was one foot long. To enable pupils to carry one in their "pencil box", a version that was half as long was introduced. 1 foot = 30.48 cm so rulers are graduated to 30 cm or half that length (= 15 cm).
The perimeter of a 12 cm x 3 cm rectangle is 2*(12+3) cm = 2*15 cm = 30 cm.The perimeter of a 12 cm x 3 cm rectangle is 2*(12+3) cm = 2*15 cm = 30 cm.The perimeter of a 12 cm x 3 cm rectangle is 2*(12+3) cm = 2*15 cm = 30 cm.The perimeter of a 12 cm x 3 cm rectangle is 2*(12+3) cm = 2*15 cm = 30 cm.
12.