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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