Finding the Perimeter of a Polygon on Grid Paper

This lesson teaches how to find the perimeter of a polygon using grid paper. It clarifies the difference between area and perimeter, emphasizing that perimeter measures the distance around a polygon, while area measures the space inside. The lesson explains common mistakes, such as confusing area with perimeter and counting whole square units instead of side lengths. It provides a step-by-step example of calculating perimeter by counting side lengths using hash marks, concluding with a recap of the key points.

Explain how hash marks can be used to count side lengths.

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What is the perimeter of the polygon if there are 14 hash marks?

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