30 cm
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9 x 4 = 36 Note: each side measures 9", and there are 4 sides to a square.
Since a square has four sides:16 miles x 4 = 64 mile perimeter
Perimeter = 4*4.5 = 18 feet
Each side measures: 52/4 = 13 cm Area = 13*13 = 169 square cm
Hint: the perimeter of a square is the sum of its four sides, so each side is one-quarter of the perimeter...