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One rectangle that has a perimeter of 30 has a length of 5 and a width of 10.
That depends. The perimeter of a rectangle equals the all the sides added together! The perimeter of a rectangle is the distance around it. The formula for finding the perimeter of a rectangle is: P = 2L + 2W (the length x 2 added to the width x 2). Example: A 5x10 rectangle has a perimeter of 30: (5x2 + 10x2 = 30)
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28 units
12+12+3+3= 30 so perimeter is 30