Question

question 18 1 pts what is the circumference of a circle whose diameter equals 12.25 inches? use = 3.1416 and round to one decimal place. 38.05 in 38 in 40 in 38.5 in

Explanation:

Step1: Recall the formula for circumference

The formula for the circumference \(C\) of a circle is \(C=\pi d\), where \(d\) is the diameter.

Step2: Substitute the given values

Given \(d = 12.25\) inches and \(\pi=3.1416\). Then \(C=3.1416\times12.25\).

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Step3: Round to one decimal place

Rounding \(38.4846\) to one decimal place. Look at the second - decimal digit, which is \(8\). Since \(8\gt5\), we round up the first - decimal digit. So \(38.4846\approx38.5\)

Answer:

\(38.5\) in (the fourth option)