Using the formula for the area of a circle

12 questions

1. Match the parts of a circle with their descriptions.
2. What is 10\pi as a decimal rounded to 3 significant figures?
3. Evaluate the expression 5x^2 when x=2.
4. Solve the equation: 4x^2 = 36
5. Which is the formula for the area of a circle?
6. What is the area of the circle?
7. The area of a circle can be calculated by multiplying \pi by the square of the ___.
8. A circle has radius 10 cm. Its area is ___ cm^2, when rounded to 3 significant figures.
9. The area of the circle is ___ cm^2.
10. The distance from the centre of a circle to its edge is 12 cm. The area of the circle is ___\pi cm^2.
11. The area of a circle is 80 cm^2. The radius is ___ cm, when rounded to 3 significant figures.
12. The area of a circle is 150 cm^2. The diameter is ___ cm, when rounded to 3 significant figures.

License: OGL