The angle of elevation of the top of a tall building...

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The angle of elevation of the top of a tall building from the points M and N at the distances of 72 m and 128 m, respectively, from the base of building and in the same straight line with it, are complementary. The height of the building (in m) is:

A. 84

B. 96

C. 80

D. 90

Answer: Option B

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