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GATE 2024 CE (CE1) – Question 26

Geomatics Engineering · Distance and angle measurement, levelling, traversing, triangulation, total station · 1 mark · Multiple choice

A surveyor observes a zenith angle of 93° 00' 00" during a theodolite survey. The corresponding vertical angle is

  1. − 03° 00' 00"
  2. + 03° 00' 00"
  3. − 87° 00' 00"
  4. + 87° 00' 00"

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Show answer and explanation

Correct answer: (A) − 03° 00' 00"

Explanation

The vertical angle is measured from the horizontal and the zenith angle from the vertical, so the vertical angle is $90° - 93° = -3°$ (an angle of depression of 3°).