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
\(\pi r^2 = 38.5\
\frac{}{} = r^2 = 38.5\
r^2 = \frac{38.5 \times 7}{22}\
r = \sqrt{12.25} = 3.5\
diameter = 2r = 2 \times 3.5 = 7cm\)
\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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