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).
⑴AD＝_______米;
⑵求旗杆AB的高度（
）.
⑴AD＝_______米;
⑵求旗杆AB的高度（
）.解：（1）设
=
，
=
··················1分
∴t
an30° = 
························ 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
=，=··················1分∴t
an30° = ························ 2分 = 解得：
=3····························3分=3∴
=6·····························4分故答案为：6
（2）∵
=3，=6∴
==3≈5.20米···················6分略
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