Posted by **ray** on Wednesday, August 25, 2010 at 10:50pm.

The drawing shows a person looking at a building on top of which an antenna is mounted. The horizontal distance between the person's eyes and the building is 85.0 m. In part a the person is looking at the base of the antenna, and his line of sight makes an angle of 35.0 with the horizontal. In part b the person is looking at the top of the antenna, and his line of sight makes an angle of 38.0 with the horizontal. How tall is the antenna?

- physics -
**drwls**, Wednesday, August 25, 2010 at 11:06pm
85 (tan 38 - tan 35) meters

This is more of a trigonometry than a physics question.

- physics -
**curt**, Monday, July 16, 2012 at 5:02pm
the question is a bit ambiguous in not specifying whether line of sight is UP from the horizontal or DOWN. the correct answer could be:

h = 85m[tan 38deg + tan 35deg]

...if the observer is in a window of a nearby building or on a hilltop, etc.

[many professors are ambiguous because they know the answer THEY want.]

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