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Measuring Classroom Object Perimeters

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Measuring Classroom Object Perimeters

Students measuring classroom objects

📏 Part 1: Understanding Perimeter

Perimeter means the distance around the outside edge of a shape. We add up all the sides!

Example: A rectangle with sides 20cm, 15cm, 20cm, 15cm has a perimeter of 20 + 15 + 20 + 15 = 70cm

1. What does perimeter mean?

The space inside a shape

The distance around the outside of a shape

The height of a shape

2. A square desk has sides of 60cm each. What is the perimeter?

120cm

180cm

240cm

3. Show your working for question 2:

📐 Part 2: Measuring Classroom Objects

Instructions: Use a measuring tape or ruler to measure these classroom objects. Measure in centimetres (cm).

4. Measure your desk (rectangle shape):

Length: _______ cm     Width: _______ cm

Perimeter = Length + Width + Length + Width = _______ cm

5. Measure a textbook (rectangle shape):

Length: _______ cm     Width: _______ cm

Perimeter = _______ + _______ + _______ + _______ = _______ cm

6. Measure the classroom door (rectangle shape):

Height: _______ cm     Width: _______ cm

Perimeter = _______ cm

7. Choose one more rectangular object in the classroom to measure:

Object: _________________

Length: _______ cm     Width: _______ cm

Perimeter = _______ cm

🌟 Part 3: Extension Challenge

8. A notice board is made of two rectangles joined together. Rectangle A is 80cm × 60cm. Rectangle B is 40cm × 60cm. What is the perimeter of the whole notice board?

Perimeter = _______ cm

9. Explain in your own words how you would find the perimeter of any shape:
10. Design your own L-shaped object using two rectangles. Draw it and calculate its perimeter:

My L-shape perimeter = _______ cm

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