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Area and Perimeter
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khanacademy.org
Finding perimeter when a side length is missing (video) | Khan Academy
The video is teaching us how to find the perimeter of a shape. To do this, we need to measure the lengths of all the sides and add them together. Sometimes we have to use clues to figure out the length of a side if it isn't labeled. The perimeter is the total distance around the outside of the shape.
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