Following angle have been measured : From Colin to Bhawani : 30° From Dev to Colin : 60° From Amar to Colin : 60°
(i) Which of the following is a pair of angle of elevation?
 (a) (a, e) (b) (b, e) (c) ( c, d) (d) ( a, f )
 (ii) Which of the following is a pair of angle of depression?
(a) ( a ,e) (b) ( b, e) (c) ( c, d) (d) ( a, f )
 

Dear student,
(i) The angle of elevation of an object as seen by an observer is the angle between the horizontal and the line from the object to the observer’s eye (the line of sight). In our case clearly( ∠b, ∠e, ∠f ) are angle of depression.
Thus (b) is correct option.
(ii) If the object is below the level of the observer, then the angle between the horizontal and the observer’s line of sight is called the angle of depression. In our case clearly ( ∠a, ∠c, ∠d ) are angle of depression.
Thus (c) is correct option.
Regards.

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