[填空题]
In a triangle ABC,AB=3 cm,BC=5w,gc+srx 9f fdh9xd1f0b.y .k cm angrje:cu m a:h8yh 1)t*d $\mathrm{A}\hat{\mathrm{C}}\mathrm{B} = \dfrac{\pi}{6}A$.
1.Find, to three significant figures, the two possible lengths of [AC]. cm cm
2.Find the difference between the areas of the two possible triangles ABC. $cm^2$