jwb nomor 12 ya pleasee

1/2a×t
90-60=30
1/2a×6=3
6√3

kalau salah maaf

[tex]C = 180 - 90 - 60 = 30 \\ \\ \frac{ sin(60) }{ BC } = \frac{ sin(30) }{ 6 } \\ BC = \frac{ 6 sin(60) }{ sin(30) } \\ BC = \frac{6\frac{\sqrt{3}}{2}}{ \frac{1}{2} } \\ BC = 6\sqrt{3} [/tex]