{"synopsis":"Perimeter is the total distance around the outside of a closed, flat shape\u2014like the fence around a yard. To find the perimeter of a polygon, add up the lengths of all the sides. There's a shortcut if it's a regular polygon, where all the sides are the same length. Then, you can multiply the length of one side by the number of sides. There are also some neat tricks to find the length of a missing side of a polygon. Press \"play\" to learn all about what happens when a love of precise perimeters collides with neighborly concern. 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