[填空题]
A lawn sprinkler is u0p apf*+hoyl7 j3i 8b u5,2b8fy)xwj i3qusnvnd5;w setup in the corner of a rectangular lawn which is enclosed by a fence. The sprinkler has a maximum spray distance of 5 m. Thed2jvn3b, s;quwu 55yxw )fn 8i 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 right 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. $m^2$
