[填空题]
A plot of farmland is j;- vwsp6f;bzlt0d m. 9:gs2nccz*bjz)d-p v shown by the shaded region in the diagram below. The plot h:)pn2gcvs9 djz- zc*bas a curved border which can be described as an arc, PQ, of a circle with centre O and radius,$r=500m$, such that $PÔQ =80^{\circ}$ The straight border of the farmland is defined by the chord PQ.
The farm owner wishes to construct a fence along the curved border of the plot.
1.Find the length of the fence to be built. m
2.Find the area of the farmland, rounding your answer to the nearest $m^2$. $m^2$
