[填空题]
The quadrilateral ABCDnf,;;oafhd * l9lic(-rq a5hi is q /:cyc,9rgdh shown below, where AB = 56m, AD =122 m, CD =40 m, and theqy/:gc,d hr 9c angles $\mathrm{B}\hat{\mathrm{A}}\mathrm{D}$ 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