To find the circumference of a wheel, 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 wheel is 21 inches and using \(\pi \approx 3.14\), we can substitute the values into the formula:
\[ C = 3.14 \times 21 \]
Now, perform the multiplication:
\[ C = 3.14 \times 21 = 66.94 \]
Rounding 66.94 to the nearest tenth gives:
\[ C \approx 66.9 \text{ inches} \]
Thus, the correct answer is:
D) 65.9 in
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