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WAEC Mathematics 2019 Paper

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Question : 21

Total: 50

The total surface area of a solid cylinder 165cm

^2

. Of the base diameter is 7cm, calculate its height. [Take

\pi = \frac{22}{7}

]

7.5 cm
4.5 cm
4.0 cm
2.0 cm

Solution:

165 = 2 x $\frac{22}{7}$ x $\frac{7}{2}$ x h + 2 x $\frac{22}{7}$ x $\frac{7}{2}$ x $\frac{7}{2}$

165 = 22h + 77

$\frac{22h}{22} = \frac{88}{22}$

height = 4cm

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