Perimeters of irregular shapes
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Free printable perimeters of irregular shapes worksheets for 3rd grade. Students add up the lengths of all sides on non-standard polygons to find the total perimeter, moving beyond simple rectangles to more complex figures. These sheets challenge students to apply the perimeter concept flexibly across varied shape types. Part of our geometry worksheets collection.
What You'll Learn
- Add all side lengths of irregular shapes to find perimeter
- Identify all sides of irregular polygons before adding
- Solve perimeter problems where sides have different lengths
FAQ
How is finding perimeter of irregular shapes different from regular shapes?⌄
With irregular shapes, students cannot use a simple formula — they must read and add each individual side length, which requires careful tracking and addition of multiple addends.
What are some examples of irregular shapes students find perimeters for in 3rd grade?⌄
Students might work with L-shapes, T-shapes, or other rectilinear figures made by combining rectangles — shapes that appear frequently in floor plans and real-world design.
What common mistake do students make when finding perimeters of irregular shapes?⌄
Students often miss unlabeled sides on rectilinear shapes, forgetting that they need to calculate missing side lengths from the information given before adding up the perimeter.
Ratings & Reviews
3Jamie T.
1st Grade Teacher · Verified download
Thanks for creating this! I'll be using it the moment it's available.
Helpful · 4
David L.
2nd Grade Teacher · Verified download
Looking forward to this! All the other ClassWeekly worksheets are excellent so I know this will be too.
Helpful · 8
Rachel H.
Homeschool parent · Verified download
We've been waiting for this topic. Signed up just to get notified when it's ready.
Helpful · 6
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