[填空题]
A lawn sprinkler is setup in the corner of a rectangular lawn which is enca2(3 rc0c *3hk5sazc:m gp.jrypc 6z rlot:3bhx ssf2 q)kv(itd g-7sp 5sed by a fence. The sprinkler has a maximum spray distance of 5 m. The lawn has side lengths 4 m and 10 m. This situation is illustrated in the diagram below, where the sprinkler is positioned in the top ri): s2kh-qbft(xv 5p3 d7g tissght corner.
1.Find the angle $\alpha$ in the diagram, leaving your answer in degrees.$\alpha$= $^{\circ}$
2.Find the area of grass that is currently being watered by the sprinkler
in this position. $m^2$
