[填空题]
Triangle Island is a small island located off the no en,jh2n06hcejx y.oz i.1, .x)xoru jrth-western tip of Britiscz ,rtd3; 5zrk:(w hc+0rdmg ih Columbia, C+ :mr(idk0,d; zrgrz w5c3ht canada. Two side lengths of Triangle Island are equal to 1600 and 1800 metres and the angle between these two sides is equal to $78^{\circ}$.
1.Calculate the length of the third side of Triangle island. m
2.Find the area of a Triangle Island in $m^2$. Give your answer in the form $a\times 10^k$, where $1 \leq a < 10$ and $k \in \mathbb Z$. $\times10^6m^2$
