题目

请看下面广告，然后做题 Happy Birthday To Wally        Welcome to QuanJiao Zoo Our lovely and cute llama in our zoo, Wally will be 5 years old on November 14.Come and join us to celebrate(庆祝) his birthday. Grandpa Lin’s Story Time Where is Wally from? What is Wally’s favorite food? Is Wally married?(结婚) Want to know more about Wally? Let Grandpa Lin tell you!!         The XiangHe TheaterPicture Drawing Let’s decorate(装饰) Wall’s home together. Elementary school(小学) students are invited to draw pictures of Wally Time:12:30p.m—2:30p.m Place: Qu5．某校九年级教师在讲“解直角三角形”一节时，带领一个小组登上学校教学楼上的一个平台，测量与学校毗邻的一生活小区的一栋居民楼AB的高度，平台C距离地面D高10米，在C处测得居民楼楼底B的俯角为22.5°，楼顶端A的仰角为60°，测完后，记录好数据，回到教师，将示意图画在黑板上，如图所示，要求全班学生按示意图，求出居民楼AB的高度．（最后结果精确到0.1）（参考数据：tan22.5°=$\sqrt{2}$-1，$\sqrt{3}$=1.73，$\sqrt{2}$=1.41）