Calculate the height of the pole

A man stands 9m away from the flag-pole. He observes that the angle of elevation of the top of the pole is 28degree and the angle of depression of the bottom of the pole is 13degree. Calculate the height of the pole.
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If we call the upper part of the pole length A and the lower part B, A=9tan28 and B=9tan13. The pole's height is A+B=9(tan28+tan13)=6.863m approx.

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