Finding Shape Perimeter Worksheet
A 3rd grade finding shape perimeter worksheet where students add the side lengths of rectangles, squares, and triangles to find each shape’s perimeter. Includes a complete answer key for quick, no-prep geometry practice.
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About this resource
Description
Perimeter is the total distance around the outside of a two-dimensional shape, and this Finding Shape Perimeter Worksheet helps third graders build that skill by adding the lengths of every side. Students work with rectangles, squares, and triangles and learn that finding the perimeter simply means combining all of the side measurements into one total.
This printable 3rd grade geometry worksheet presents six labeled shapes, each with its side lengths marked in units such as centimeters, feet, inches, and meters. Children add the sides of each figure, write the perimeter on the answer line, and then check their work against the included answer key. Use it as morning work, a math-center task, homework, or a quick review before a geometry quiz.
What’s Included
- 1 print-ready PDF worksheet
- Answer key
- 6 shape perimeter problems (rectangles, squares, and triangles)
This Finding Shape Perimeter Worksheet helps kids learn in three ways. First, the clearly labeled sides make it easy for students to see exactly which numbers to add, reinforcing that perimeter is a sum. Second, mixing rectangles, squares, and triangles builds flexible thinking so learners can find the perimeter of any polygon, not just one kind of shape. Third, the built-in answer key gives instant feedback, so children can spot and correct their own mistakes and build confidence.
Teachers and parents can extend this skill with hands-on practice. Have students measure the perimeter of real objects like a book, a desk, or a picture frame with a ruler. Turn it into a game by drawing shapes on grid paper and challenging kids to find the longest perimeter, or head outside and pace off the perimeter of a garden or playground. Connecting perimeter to everyday spaces makes the concept stick.
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