22cm
14cm
7cm
6cm
Correct answer is C
\(\pi r^2 = 38.5\\ \frac{}{} = r^2 = 38.5\\ r^2 = \frac{38.5 \times 7}{22}\\ r = \sqrt{12.25} = 3.5\\ diameter = 2r = 2 \times 3.5 = 7cm\)
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