Mathematics · Levelling

In levelling, how is the reduced level (RL) of a subsequent point determined using the Height of Instrument (HI) method?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1Adding Intermediate Sight (IS) to Reduced Level
2Adding Fore Sight (FS) to Height of Instrument
3Subtracting Back Sight (BS) from Height of Instrument
4Subtracting Fore Sight (FS) or Intermediate Sight (IS) from Height of Instrument✓

Correct answer

Subtracting Fore Sight (FS) or Intermediate Sight (IS) from Height of Instrument

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