Perimeter: introduction (video) | Perimeter | Khan Academy
https://www.khanacademy.org/math/cc-third-grade-math/3rd-perimeter/imp-perimeter/v/introduction-to-perimeter
WEBPerimeter is a math concept that measures the total length around the outside of a shape. To find the perimeter, you add together the lengths of all the sides. This works for any shape, including triangles, rectangles, pentagons, and even irregular polygons. Created by Sal Khan. Questions. Tips & Thanks. Want to join the conversation? Log in.
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