**Q5: **

Write this ratio in its simplest form: The ratio of the circumference of a circle to its radius.

- A
- B
- C
- D

**Q6: **

The formula for the circumference of a circle is . Rearrange this formula to make the subject.

- A
- B
- C
- D
- E

**Q7: **

Work out the circumference of the circle given that , giving your answer accurate to two decimal places.

**Q8: **

Using to approximate , what is the difference in circumference between a circle of radius 77 cm and one of radius 63 cm?

**Q9: **

Using 3.14 to approximate , what is the difference in circumference between a circle of radius 30 cm and one of radius 15 cm?

**Q10: **

The circumference of a circle is a function of its diameter represented by the equation . If the diameter is the input and the circumference is the output, calculate the circumference when the diameter is 5.

- A
- B
- C

**Q11: **

Find the circumference of a circle whose radius is 12.4 cm. Give your answer to the nearest centimetre.

**Q12: **

Using 3.14 to approximate , what is the difference in circumference between a circle of diameter 100 cm and one of radius 15 cm?

**Q13: **

Using 3.14 to approximate , what is the difference in circumference between a circle of diameter 80 cm and one of radius 15 cm?

**Q14: **

Using 3.14 to approximate , what is the circumference of a circle of diameter 34 cm?

**Q15: **

Answer the following questions for the circle shown.

Work out the circumference giving your answer in terms of .

- A
- B
- C
- D
- E

Work out the area of the circle giving your answer in terms of .

- A
- B
- C
- D
- E

**Q16: **

Using to approximate , what is the difference in circumference between a circle of diameter 63 cm and one of diameter 49 cm?

**Q17: **

Work out the circumference of a circle with a diameter of 10 inches, giving your answer to two decimal places.

**Q18: **

Using 3.14 to approximate , what is the circumference of a circle where half of the diameter is 40 cm?

**Q19: **

Use in place of to decide: which is greater, the perimeter of a 9 cm by 17 cm rectangle or the circumference of a circle with radius 10 cm.

- Athe perimeter of the circle
- Bthe perimeter of the rectangle

**Q20: **

Use in place of to decide: which is greater, the perimeter of a 5 cm by 10 cm rectangle or the circumference of a circle with radius 12 cm.

- Athe perimeter of the circle
- Bthe perimeter of the rectangle

**Q21: **

What is the formula for the circumference of a circle with radius ?

- A
- B
- C
- D

**Q22: **

If the radius of a circle equals 13.8 cm, find the length of its longest chord.

**Q23: **

If the radius of a circle equals 22.4 cm, find the length of its longest chord.

**Q24: **

The formula for the circumference of a circle is . Find the circumference of a circle with a diameter of 12 in. Give your answer in terms of , knowing that the diameter is equal to .

- A in
- B in
- C in
- D in

**Q25: **

Find, to the nearest hundredth, the circumference of a circle of diameter 55.5 cm.