Question on: JAMB Mathematics - 2014
A
20\(\sqrt{3}\)cm
B
10\(\sqrt{3}\)cm
C
5\(\sqrt{3}\)cm
D
4\(\sqrt{3}\)cm
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Correct Option: B
In the figure above, (\frac{x}{\sin 60^o} = \frac{10}{\sin 30^o}) (Sine rule)
x = (\frac{10 \sin 60^o}{\sin 30^o})
= 10 x (\frac{\sqrt{3}}{2} \times \frac{1}{2})
= 10 x (\frac{\sqrt{3}}{2} \times \frac{2}{1})
= 10(\sqrt{3})cm
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