Question

A 20-inch bicycle has tires with a diameter of 20 inches. What is the circumference of these tires?

A.
31.4 inches

B.
62.8 inches

C.
314 inches

D.
1,256 inches

Answer 1

To find the circumference of a circle (or tire in this case), you can use the formula:

\[
C = \pi \times d
\]

where \(C\) is the circumference and \(d\) is the diameter.

Given that the diameter of the tires is 20 inches, we can substitute this value into the formula:

\[
C = \pi \times 20
\]

Using the approximation of \(\pi \approx 3.14\):

\[
C \approx 3.14 \times 20 = 62.8 \text{ inches}
\]

Therefore, the circumference of the tires is approximately 62.8 inches.

The correct answer is:

**B. 62.8 inches**