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人教版数学教材九年级下册第92页上有这样一道例题:热气球的探测器显示,从热气球看一栋高楼顶部的仰角为30°,看这栋高楼底部的俯角为60°,热气球与高楼的水平距离为120m,这栋高楼有多高?(结果保留小数点后一位)
Human Piano Edition textbook ninth grade volume on the next page on page 92 there is such a case: the hot air balloon detector shows a balloon from the hot air balloon elevation angle of 30 ° to see the bottom of this building depression angle of 60 °, Hot air balloon and the height of the building is 120m, how tall is the tall building? (The result is one decimal place)