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(2008•铜仁地区)数学组活动,老师带领学生去测塔高,如图,从B点测得塔顶A的...
(2008•铜仁地区)数学组活动,老师带领学生去测塔高,如图,从B点测得塔顶A的仰角为60°,测得塔基D的仰角为45°,已知塔基高出测量仪20m,(即DC=20m),则塔身AD的高为
米.
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