Finding Quadrilateral Side Lengths
Grade 3•45 minutes
Learning Objective
I can use addition and subtraction to determine the length of an unknown side of a quadrilateral when given the perimeter and the lengths of the other three sides.
Practice Questions
This lesson includes 7 practice questions to reinforce learning.
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1. What does "perimeter" mean? Explain it in your own words.
2. A quadrilateral has sides of 3 cm, 7 cm, and 5 cm. If the perimeter is 20 cm, what is the length of the missing side? Show your work.
3. Imagine a square with three sides that each measure 6 meters. If the perimeter of the square is 24 meters, what is the length of the fourth side?
...and 4 more questions
Educational Video
Finding missing side length when given perimeter | Math | 3rd grade | Khan Academy
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