The angle of view
Determine the angle of view at which the observer sees a rod 16 m long when it is 18 m from one end and 27 m from the other.
Correct answer:

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You need to know the following knowledge to solve this word math problem:
- planimetrics
- Pythagorean theorem
- right triangle
- triangle
- The Law of Cosines
- goniometry and trigonometry
- cosine
- arccosine
Units of physical quantities:
Grade of the word problem:
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