1. A circular garden has a diameter of 28 feet. To find its circumference, which approximation for $\pi$ would be most efficient to use for calculation?
2. A bicycle wheel has a radius of 14 inches. Using $\pi \approx \frac{22}{7}$, the approximate circumference of the wheel is ___ inches.
3. A circular plate has a diameter of 20 cm. Using the approximation $\pi \approx 3.14$, its circumference is ___ cm.
4. A circular pond has a radius of 9 meters. Which expression represents the exact circumference of the pond?
5. A vinyl record has a diameter of 12 inches. Using $\pi \approx 3.14$, what is the approximate circumference of the record?
6. A circular rug has a diameter of 20 feet. Using 3.14 for π, what is its circumference in feet? The circumference is ___ feet.
7. The number π (pi) represents the ratio of a circle's circumference to which of its other measurements?
8. The radius of a circular garden is 5 meters. What is its circumference in meters? Use 3.14 for π. The circumference is ___ meters.
9. A bicycle wheel has a diameter of 8 inches. What is its approximate circumference? Use 3.14 for π.
10. The circumference of a large circular pizza is 62.8 inches. Using 3.14 for π, what is the diameter of the pizza? The diameter is ___ inches.