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Circle Circumference Practice Worksheet

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Circle Circumference Practice Worksheet worksheet preview

Circle Circumference Practice Worksheet

Circle with radius and circumference labeled

📐 Part 1: Learning the Formula

Remember: Circumference = π × diameter OR Circumference = 2 × π × radius

Use π = 3.14

1. A circle has a radius of 5 cm. Follow the steps to find the circumference:
Circle with radius labeled 5 cm

Step 1: Write the formula: C = 2 × π × r

Step 2: Substitute the values: C = 2 × 3.14 × ____

Step 3: Calculate: C = ________ cm

2. A circle has a diameter of 8 cm. Follow the steps:
Circle with diameter labeled 8 cm

Step 1: Write the formula: C = π × d

Step 2: Substitute the values: C = 3.14 × ____

Step 3: Calculate: C = ________ cm

3. Which formula would you use for a circle with radius 3 cm?

C = π × d

C = 2 × π × r

✏️ Part 2: Practice Questions

4. Find the circumference of a circle with radius 7 cm.
Circle with radius labeled 7 cm
5. Find the circumference of a circle with diameter 12 cm.
Circle with diameter labeled 12 cm
6. A circular pond has a radius of 4.5 metres. What is its circumference?
Circle with radius labeled 4.5 m
7. Complete the table:
Radius (cm) Diameter (cm) Circumference (cm)
6 ____ ____
____ 10 ____

🎯 Part 3: Challenge Questions

8. Exam-style: A bicycle wheel has a diameter of 70 cm. How far will the bicycle travel when the wheel makes 10 complete rotations? Give your answer to the nearest metre.
Circle with diameter labeled 70 cm
9. Exam-style: A circular running track has a circumference of 628 metres. What is the radius of the track? Show all your working.

Hint: Rearrange the formula to find the radius

Circle with circumference labeled 628 m

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