Finding perimeter when a side length is missing

3rd-perimeter--perimeter-of-polygons-with-missing-side-lengths--finding-perimeter-when-a-side-length-is-missing-math-3rd-grade-khan-academy
Perimeter
Perimeter of polygons with missing side lengths

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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