🏖️ Part 1: Understanding Perimeter

1. What is perimeter? Circle the best answer:

The area inside a shape

The distance around the outside of a shape

The height of a shape

The width of a shape

2. Which tools can help us measure perimeter? Check all that apply:

Ruler

Measuring tape

String

Calculator only

3. Fill in the blanks:

To find the perimeter of a shape, I need to _________ all the side lengths together. I must use the same _________ for all measurements, such as centimetres or metres.

📏 Part 2: Measuring Practice

4. Look at this rectangle. If the length is 8cm and the width is 5cm, what is the perimeter?

Perimeter = _______ cm

5. A triangle has sides measuring 6cm, 4cm, and 7cm. Calculate the perimeter:

Perimeter = _______ cm

6. Draw a square with sides of 3cm each. Then calculate its perimeter:

Perimeter = _______ cm

🐚 Part 3: Seashore Shape Measurements

7. Use your seashore collage from the previous lesson. Measure each side of your shapes and record below:

Shape 1: _________________

Side 1: _______ cm

Side 2: _______ cm

Side 3: _______ cm

Side 4: _______ cm (if needed)

Perimeter = _______ cm

Shape 2: _________________

Side 1: _______ cm

Side 2: _______ cm

Side 3: _______ cm

Side 4: _______ cm (if needed)

Perimeter = _______ cm

8. Which shape in your collage has the longest perimeter? Explain why:

🌊 Part 4: Real-World Connections

9. Match the real-world examples with why we might need to measure perimeter:

1. Building a fence around a garden

2. Walking around a beach

3. Putting trim around a picture frame

4. Measuring a sports field boundary

A. To know how much decorative border to buy

B. To calculate the distance of your walk

C. To know how much fencing material to purchase

D. To ensure the field meets official size requirements

10. Imagine you found a starfish shape on the beach. If each of its 5 arms measures 4cm, what would be the perimeter?

Perimeter = _______ cm

11. Explain in your own words what you learned about measuring perimeter today:

⭐ Part 5: Challenge Questions

12. A seashell collector wants to make a rectangular display case. If the case is 15cm long and 12cm wide, how much trim will they need to go around the edge?

Answer: _______ cm of trim

13. Draw your own seashore shape and label each side with a measurement. Then calculate its perimeter:

My shape's perimeter = _______ cm

14. True or False: If I double the length of each side of a square, the perimeter will also double.

True

False

Explain your answer: _________________________________________________