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add all the sides together or if it has two sides the same number, multiply the number by the number of numbers. Also if the shape is not a regular shape break it apart into a shape you know and when you are done add all the perimeters of the shapes you broke apart together. The formula is length times width. Are you a grownup????!!!!! 'Cause that would be WEIRD

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14y ago

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Q: How do you find the perimeter of something in math?
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