x tan alfa = 1 per akar 3

[tex] \tan( \alpha ) = \frac{1}{ \sqrt{3} } \\ \sin(30) = \frac{1}{2} \\ \cos(30) = \frac{1}{2} \sqrt{3} \\ \tan(30) = \frac{ \sin(30) }{ \cos(30) } = \frac{ \frac{1}{2} }{ \frac{ \sqrt{3} }{2} } = \frac{1}{ \sqrt{3} } \\ \tan( \alpha ) = \frac{1}{ \sqrt{3} } \\ \alpha = 30[/tex]
semoga menjawab pertanyaan nya