Third Grade Perimeter Test Questions with Answers

📚 Quick Study Guide

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• Definition: Perimeter is the total distance around the outside of a 2D shape.
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• How to Calculate: Add up the lengths of all the sides.
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• Squares: Since all sides are equal, Perimeter = 4 * side length.
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• Rectangles: Perimeter = 2 * (length + width). Written as $P = 2(l + w)$
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• Triangles: Add the lengths of the three sides. $P = a + b + c$
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• Units: Always remember to include the units (cm, m, inches, etc.) in your answer!

🧪 Practice Quiz

1. What is the perimeter of a square with a side length of 5 cm?
   1. 10 cm
   2. 15 cm
   3. 20 cm
   4. 25 cm
2. A rectangle has a length of 8 meters and a width of 3 meters. What is its perimeter?
   1. 11 meters
   2. 16 meters
   3. 22 meters
   4. 24 meters
3. What is the perimeter of a triangle with sides of 4 inches, 6 inches, and 5 inches?
   1. 10 inches
   2. 12 inches
   3. 15 inches
   4. 20 inches
4. A square has a perimeter of 36 cm. What is the length of each side?
   1. 6 cm
   2. 9 cm
   3. 12 cm
   4. 18 cm
5. A rectangle has a perimeter of 20 meters. If the length is 6 meters, what is the width?
   1. 2 meters
   2. 4 meters
   3. 8 meters
   4. 14 meters
6. What is the perimeter of a shape with sides: 2cm, 3cm, 4cm and 5cm?
   1. 9 cm
   2. 10 cm
   3. 14 cm
   4. 16 cm
7. If a garden has a perimeter of 48 feet and it is a square, how long is one side of the garden?
   1. 8 feet
   2. 12 feet
   3. 16 feet
   4. 24 feet