Circumference of a circle

12 questions

1. Which part of the circle is labelled?
2. If a circle has a diameter of 12 cm then its radius will be ___ cm.
3. \pi is the ratio between which two parts of a circle?
4. Which two formulae can be used to calculate the circumference of a circle?
5. A circle with diameter 12 cm has a circumference of ___ cm.
6. A circle with radius 20 cm has a circumference of ___ cm.
7. Which part of the circle is labelled?
8. A circle with a diameter of 6 cm has a circumference of ___ cm, when rounded to 1 decimal place.
9. The circumference of the circle is ___ cm, when rounded to 3 significant figures.
10. Which calculation would find the radius of a circle with circumference 20 cm?
11. The circumference of a circle is 30 cm. The diameter of the circle is ___ cm, when rounded to 1 decimal place.
12. Starting with the smallest, sort the circles in ascending order of size.

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