[填空题]
A plot of farmland is showye h-yccf0wez 1q:(9nn by the shaded region xk/j sn xer: npbf3rc0i4j77*in the diagram below. The plot has a curved border which can be described as an arc, PQ, of a circle with centre O an *if7s:b34/rnk0x cpjx7r ej nd 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 $m^2$. $m^2$
