A small coin and a large dinner plate are both perfect circles. How does the ratio of circumference to diameter for the coin compare to the ratio for the plate?

It depends on the specific measurements.

A student measures a circular rug and finds its circumference is 62 feet and its diameter is 20 feet. What is the best conclusion from these measurements?

The measurements are incorrect because $\frac{62}{20}$ is not exactly 3.14.

The measurements are reasonable because the ratio $\frac{62}{20}$ is close to $\pi$.

The rug is not a perfect circle because the diameter should be larger.

Pi is equal to 3.1 for this specific rug.

Circumference Practice — Grade 6 math

Lesson 47: Circumference — Practice Questions

1. A circular garden has a diameter of 20 feet. Using the approximation $\pi \approx 3.14$, what is the circumference of the garden in feet? The circumference is ___ feet.
2. A small coin and a large dinner plate are both perfect circles. How does the ratio of circumference to diameter for the coin compare to the ratio for the plate?
- A. The coin's ratio is smaller.
- B. The plate's ratio is larger.
- C. The ratios are the same.
- D. It depends on the specific measurements.
3. A bicycle wheel has a radius of 12 inches. What is its circumference? Use $\pi \approx 3.14$. The circumference is ___ inches.
4. The circumference of a circular swimming pool is 94.2 meters. Using $\pi \approx 3.14$, what is the diameter of the pool in meters? The diameter is ___ meters.
5. A student measures a circular rug and finds its circumference is 62 feet and its diameter is 20 feet. What is the best conclusion from these measurements?
- A. The measurements are incorrect because $\frac{62}{20}$ is not exactly 3.14.
- B. The measurements are reasonable because the ratio $\frac{62}{20}$ is close to $\pi$.
- C. The rug is not a perfect circle because the diameter should be larger.
- D. Pi is equal to 3.1 for this specific rug.
6. A circular swimming pool has a diameter of 40 feet. What is its circumference in feet? Use 3.14 for $\pi$. The circumference is ___ feet.
7. A circular pizza has a diameter of 14 inches. Which expression correctly calculates its approximate circumference? Use 3.14 for $\pi$.
- A. $3.14 \times 14 \text{ inches}$
- B. $2 \times 3.14 \times 14 \text{ inches}$
- C. $3.14 \times 7 \text{ inches}$
- D. $3.14 \times (14 \text{ inches})^2$
8. A car tire has a diameter of 25 inches. Calculate its circumference using $\pi \approx 3.14$. The circumference is ___ inches.
9. If the diameter of a circle is doubled, what is the effect on its circumference?
- A. It is doubled.
- B. It is quadrupled.
- C. It is halved.
- D. It does not change.
10. A circular plate has a radius of 5 inches. What is its circumference? Use 3.14 for $\pi$. The circumference is ___ inches.