find the height of a vertical pole when it is found that on walking towards it 20 m in a horizontal line through its base the angular elevation of its top changes from 30 deg. to 45 deg.
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Refer the following similar link :
https://www.meritnation.com/ask-answer/question/20-m-towards-chimney-in-a-horizontal-line-through-its-b/some-applications-of-trigonometry/6426212
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