WAEC - Mathematics (2005 - No. 27)
What is the total surface area of a closed cylinder of height 10cm and diameter 7cm? [Take \(\pi = \frac{22}{7}\)]
77cm2
227cm2
297cm2
374cm2
Explanation
T.S.A of s closed cylinder = \(2\pi r(r+h)\\
=\frac{2}{1}\times \frac{22}{7} \times \frac{7}{2}\left(\frac{7}{2}+\frac{10}{1}\right)=\frac{22}{1}\left(\frac{27}{2}\right) = 27 \time 11=297cm^2\)
=\frac{2}{1}\times \frac{22}{7} \times \frac{7}{2}\left(\frac{7}{2}+\frac{10}{1}\right)=\frac{22}{1}\left(\frac{27}{2}\right) = 27 \time 11=297cm^2\)
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