题目

如图1是一台手机支架，图2是其侧面示意图，，可分别绕点，转动，测量知，．当，转动到，时，点到的距离为_____________cm．（结果保留小数点后一位，参考数据：，） 答案：【答案】6.3【解析】作辅助线如图，则四边形CDGF是矩形，可得CD=FG，然后分别解直角△ABG和直角△BCF求出BG和BF的长即可．解：如图，作CD⊥AE于点D，作BG⊥AE于点G，作CF⊥BG于点F，则四边形CDGF是矩形，∴CD=FG，在直角△ABG中，，，∴（cm），∠ABG=30°，∵，∴∠CBF=20°，∴∠BCF=70°，在直角△BCF中，，∠BCF=单词拼写。 根据句意和首字母提示，补全各小题单词。1.You can practice soccer by j a sports club.2.Who e in my class will go to the movie besides me?3.May is the f_________ month of a year.4.I often help my parents do h_________ on weekends, such as doing some cleaning.5.Now more and more young teachers v__________________ to teach in the countryside.