Perimeter: Find Missing Side Lengths
Browse 0 free printable Perimeter: Find Missing Side Lengths worksheets for Fourth Math. These Geometry worksheets are designed to give students targeted practice and build confidence in math.
Worksheets are available at multiple difficulty levels — Easy, Medium, and Hard — so you can meet every student where they are. Each worksheet is an instant PDF download: print as many copies as you need for your classroom, tutoring sessions, or home practice at no cost.
Whether you're a teacher looking for geometry practice problems, a homeschool parent building a Fourth curriculum, or a tutor helping a student catch up, these free printable worksheets are ready to use today.
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Practice Questions
- A square has a perimeter of 16 ft. Three sides are 4 ft each. What is the length of the missing side?
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(A) 4 ft
- A pentagon has a perimeter of 21 cm. Four sides are 3 cm, 4 cm, 5 cm, and 6 cm. What is the length of the missing side?
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(A) 3 cm
- A hexagon has a perimeter of 25 ft. Five sides are 4 ft, 3 ft, 5 ft, 6 ft, and 2 ft. What is the length of the missing side?
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(A) 5 ft
- A triangle has a perimeter of 14 cm. Two sides are 5 cm and 6 cm. What is the length of the missing side?
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(A) 3 cm
- A pentagon has a perimeter of 24 ft. Four sides are 4 ft, 5 ft, 6 ft, and 3 ft. What is the length of the missing side?
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(A) 6 ft
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Quick Tip
Teacher Resources
Teaching Notes
Introduce perimeter as the distance around a shape. Emphasize using addition for known sides and subtraction from the total perimeter to find the missing length.
Vocabulary
Common Mistakes
- Adding all given numbers without considering the total perimeter.
- Confusing perimeter with area.
- Incorrectly calculating the sum of known sides.
Differentiation
Discussion Questions
- What is perimeter, and why is it important?
- How do you use addition and subtraction to find a missing side?
- Can two shapes have the same perimeter but different side lengths?
- When might you need to find a missing side in real life?
Extension Activities
- Draw shapes with given perimeters.
- Find missing sides of irregular shapes.
- Calculate perimeter of real objects.
Parent Tip
Help your child measure the edges of objects around the house.
Learning Path
Skill Cluster
Measurement: Perimeter
Estimated Time
15 minutes