[填空题]
The quadrilateral ABCD hs(cq d/4yj jowc);ut8as side lengths AB =17 cm, BC = nssfl7 /6 1eyn12cm, and CD = 11cm. The size of y6sn1/fesnl7 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 $\mathrm{A}\hat{\mathrm{B}}\mathrm{C}$. $^{\circ}$
