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歡迎您訪問數學考題練習:如圖,為了測量電視塔AB的高度,在C、D兩點測!

數學考題練習:如圖,為了測量電視塔AB的高度,在C、D兩點測

更新時間:2024-01-12 16:38:48作者:貝語網校

如圖,為了測量電視塔AB的高度,在C、D兩點測得塔頂A的仰角分別為30°,45°.已知C、D兩點在同一水平線上,C、D間的距離為60米,測傾器CF的高為1.5米,求電視塔AB的高.(精確到0.1米)

試題答案

解:在Rt△ADE中,DE==AE,

Rt△ACE中,CE==AE,

∵CD=CE-DE,

∴AE==30(+1)米=81.96米

所以電視塔高為81.96米+1.5米=83.46米≈83.5米.

答:電視塔AB的高約83.5米.

試題解析

根據AE和∠ADE、AE和∠ACE可以求得DE、CE的長度,根據CD=CE-DE可以求出AE的長度,即可解題.

點評:本題考查了特殊角的三角函數值,考查了三角函數在直角三角形中的應用,本題中求DE、CE的長度是解題的關鍵.

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