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A sailor in a boat looks up at the top of a cliff. What is the angle between the line of sight and the horizontal called?
AThe angle of depression
BThe angle of reflection
CThe angle of rotation
DThe angle of elevation
Answer & Solution
Correct answer: D. The angle of elevation
1. The top of the cliff sits above the horizontal plane through the sailor's eyes.
2. The angle of elevation is the angle formed by the line of sight and the horizontal plane for an object above it.
3. The cliff can be treated as a vertical line, which gives a right-angled triangle.
4. In trigonometry the angle of inclination means the same thing as the angle of elevation.
_Source: Siyavula Mathematics Grade 10 (Everything Maths, CC BY 4.0), Chapter 11: Trigonometry_
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