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The language of the question is too ambiguous. In mathematics, we use precise language to avoid this problem. point a is 40 metres from the base of building B the angle of elevation to the top of building C is 51 degree and to the top of the flagpole D on top of building is 56 dedree

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Q: From point A 40 meters from the base of building B the angle of elevation to the top of building C is 51 degree and to the top of the flagpole D on top of building is 56 degree Find height flagpole th?
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