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Some Applications of Trigonometry
CH09 Question Bank
CBSE_CH09_QUESTION_BANK
Grade 10
Question:
The angle of elevation of the top of a tower from a point on the ground, and the angle of depression of that same point as seen from the top of the tower, are:
Key Concept: Both angles are formed with parallel horizontal lines and the same line of sight (transversal), making them alternate angles, hence equal.
Since the two horizontal lines (at the point and at the top of the tower) are parallel, and the line of sight is a transversal, the angle of elevation and the angle of depression are alternate angles and therefore equal. [1.0 Mark]
Correct Answer:Always equal
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