How to calculate a missing polygon side using perimeter
In short: This video demonstrates how to identify unknown side lengths of polygons when the total perimeter and all other side lengths are already known.
Designed for 3rd grade learners, the lesson builds on 2nd grade skills like adding and subtracting two-digit whole numbers. As students progress into 3ron grade, the curriculum introduces more complex operations, including multiplication, division, and the concept of fractions.
Beyond side lengths, the video serves as an introduction to broader mathematical concepts such as area and place value.
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Sources
- Summary by Intellect · source: Finding missing side length when given perimeter | Math | 3rd grade | Khan Academy
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