alleryIf the angle of depression of an object from the top of a tower is 30 degrees, the angle of elevation of the tower top from the object is
A45 degrees
B30 degrees
C60 degrees
D90 degrees
Answer & Solution
Correct answer: B. 30 degrees
1. Angle of depression and angle of elevation are alternate interior angles.
2. They are always equal when lines of sight cross parallel horizontals.
3. Hence the elevation equals 30 degrees.
_Source: syllabus Mathematics, Ch 9 "Some Applications of Trigonometry", §9.2_
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