Question

（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（）.

Answer

【解析】
（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