Plane trigonometry with practical applications, by Leonard E. Dickson.

58 TRIGONOMETRY [Art. 39 with the mirror. What is the distance and direction of the object from the eye? 17.* A man observes that the horizontal angle subtended by a cylindrical gas tank is 12~, and after moving 400 feet directly away from the tank the angle is 8~. What is the radius of the tank? 18.* A man in a balloon observes that the angle of depression of a house due north is 33~. After the balloon drifts horizontally 4 miles due west, the angle is 210. How high is the balloon? 19.* A hill is due south of one milestone A and is due east of an adjacent milestone B on the same straight horizontal road. At A the angle of elevation of the top of the hill is 40~ and at B 27~. How high is the hill?

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Title
Plane trigonometry with practical applications, by Leonard E. Dickson.
Author
Dickson, Leonard E. (Leonard Eugene), 1874-
Canvas
Page 58
Publication
Chicago,: B. H. Sanborn & co.
[c1922]
Subject terms
Plane trigonometry.

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"Plane trigonometry with practical applications, by Leonard E. Dickson." In the digital collection University of Michigan Historical Math Collection. https://name.umdl.umich.edu/abn8205.0001.001. University of Michigan Library Digital Collections. Accessed June 16, 2025.
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