[填空题]
In a school playground, the grass icwzbj ;*d+) hns watered by lawn sprinklersl z /z6*:ktmqq that are set to sp zkm/ql q*z6t:ray at an arc of $220^{\circ}$ with a maximum spray distance of 55 metres, as shown in the diagram below.
1.Calculate the area of grass that is watered by this sprinkler. $m^2$
2.Calculate the length of the sprinkler arc edge, where the maximum
spray distance lands. m
