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The horizontal line through the observer's eye, used as the reference for elevation and depression, is called the:

Class 10Heights and DistancesTrigonometry
  • Ahorizontal level / line of sight reference
  • Bvertical level
  • Cdiagonal line
  • Dtangent line

Step-by-Step Solution

Angles of elevation and depression are always measured from the horizontal level through the observer's eye.
Answer: A) horizontal level / line of sight reference

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