如图,为了测量电线杆 AB 的高度,小明将测放在与电线杆的水平距离为9 m 的 D 处。若测 CD 的高度为1.5 m ,在 C 处测得电线杆顶端 A 的仰角为 36°,则电线杆 AB 的高度约为 ▲ m (精确到0.1 m )。(参考数据: sin 36°≈0.59, cos 36°≈0.81, tan 36°≈0.73)
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