[填空题]
The quadrilateral ABCD has si61,nbvx2 clip de lengths AB =17 cm, BC = 12cm, and CD = 11cl8zn*/ j*a9l l2ua,a f )bh(qmqef v7lm. The size a)la7( fz b2qf mahn*9 ,*lu/ell8jvqof 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 $\mathrm{A}\hat{\mathrm{B}}\mathrm{C}$. $^{\circ}$
