Question on: WAEC Mathematics - 2000
The area of a circle is 38.5cm2. Find its diameter [take (\pi = \frac{22}{7})]
A
22cm
B
14cm
C
7cm
D
6cm
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Correct Option: C
(\pi r^2 = 38.5<br /> \frac{}{} = r^2 = 38.5<br /> r^2 = \frac{38.5 \times 7}{22}<br /> r = \sqrt{12.25} = 3.5<br /> diameter = 2r = 2 \times 3.5 = 7cm)
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