[填空题]
The quadrilateral ABCdd8imsi8cw: 9uxuqt /gd0l 5;D is shown ;dp5exd 2d x;,w g)qhfbelow, where AB = 56m, AD =122 m, CD =40 m, and the anglehp xxd2wqddf;) ;5, ges $\mathrm{B}\hat{\mathrm{A}}\mathrm{D}$ and $\mathrm{A}\hat{\mathrm{D}}\mathrm{C}$ are $68^{\circ}$ and $80^{\circ}$ respectively.
1.Find the length of line AC. m
2.Find the area of triangle ACD. $m^2$
3.Find the angle $\mathrm{D}\hat{\mathrm{A}}\mathrm{C}$. Give your answer in degrees correct to one
decimal place. $^{\circ}$
4.Find the shortest distance between point B and the line AC. m
5.Find the length of the perimeter of triangle ABC. m