[填空题]
A toy house has a roof in thh:xvr:ury /*q e shape of a right-angled isosceles triangle, ABC.ABu ::vy xh*rrq/j z3kqgu5)i h/qw.r d-i)j.g3rd kq hw/ q5-zu = 6 cm and angle $\textrm{A}\hat{\textrm{C}}\textrm{B}=90^{\circ}$.
1.Find the length of AC. cm
2.Calculate the area of triangle ABC. $cm^2$
The garage of the toy house also has a roof in the shape of right-angled triangle, LMN. , angle $\textrm{L}\hat{\textrm{M}}\textrm{N}=56^{\circ}$ and angle $\textrm{N}\hat{\textrm{L}}\textrm{M}=90^{\circ}$.
3.Calculate the length of MN. cm
