physics
posted by jo .
a television antenna is on the roof of the building. from a pt. on the ground 36.0 feet from the building , the angle of elevation of the top and the bottom of the antenna are 51 degree celsiusand 42 degree celsuis respectively. how tall is antenna?

physics 
Henry
tan42 = h1/36.
h1 =36*tan42 = 32.4 Ft. = Ht. of Bldg.
tan51 = (h1+h2)/36.
h1+h2 = 36*tan51 = 44.5 Ft. = Ht. of Bldg. plus ant.
hi + h2 = 44.5
h2 = 44.5  h1 = 44.5  32.4 = 12.1 Ft. = Ht. of ant.
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