[填空题]
The quadrilateral ABCD wbp .m nhqh-p .+qx5)(z-lp38b nv xgshas side lengths AB =17 cm, BC = 12cm,9o bdxaq5 t5g7 and CD = 11cm. The size of75b xqt9ad5 og angle $\mathrm{A}\hat{\mathrm{D}}\mathrm{C}$ is $105{\circ}$ and the size of angle $\mathrm{C}\hat{\mathrm{A}}\mathrm{D}$ is $25^{\circ}$.
1.Find the length of AC in centimetres. cm
2.Find the size of angle $\mathrm{A}\hat{\mathrm{B}}\mathrm{C}$. $^{\circ}$
