题目内容

(本题满分6分)莲城中学九年级数学兴趣小组为测量校内旗杆高度,如图,在C点测得旗杆顶端A的仰角为30°,向前走了6米到达D点,在D点测得旗杆顶端A的仰角为60°(测角器的高度不计).

⑴ AD=_______米;

⑵ 求旗杆AB的高度().

 

解:(1)设==··················1分

∴tan30° = ························ 2分

 =

解得:=3····························3分

=3

=6·····························4分

故答案为:6

(2)∵=3,=6

==3≈5.20米···················6分

解析:略

 

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