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Simply add up the length of all 8 sides. If the problem tells you that all sides are equal, you can simply take the length of one side and multiply it by 8.
A shorter length
take area and divide by length. this will give you width. take 2times width plus 2 times length and that is the perimeter
The length of your foot should but not on everyone. The average person's foot measures up.
put in cosine in your calculator and then take the cosine of the length of the adjacent length over the length of the hypotenuses length