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JAMB - Mathematics (1979 - No. 50)

Find x in the diagram below.
3\(\sqrt{3}\)
\(\frac{3(\sqrt{3} - 1)}{\sqrt{3} + 1}\)
\(\frac{(\sqrt{3} - 1)}{\sqrt{3} + 1}\)
\(\frac{3 - 1}{\sqrt{3} + 1}\)

설명

\(\frac{x + 3}{sin 60^o}\) = \(\frac{x}{sin 306o}\)

3sin 30o = x sin 60o - x sin 30o

= x(sin 60o - sin 30o)

but sin 30o = \(\frac{1}{2}\)

sin 60o = \(\frac{3}{2}\) = \(\frac{3(\sqrt{3} - 1)}{\sqrt{3} + 1}\)

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