The forebearing of the lines AB and BC are measured as 146°30' and 68°30'. The included angle ABC is recorded as

This question was previously asked in
WBPSC JE Civil 2016 Official Paper
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  1. 102°
  2. 155°
  3. 78°
  4. 25°

Answer (Detailed Solution Below)

Option 1 : 102°
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Detailed Solution

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Diagram

From the above figure,

∠ABC = 360° - (Back Bearing of AB – Fore Bearing of BC)

Back Bearing of AB = 180° + 146° 30’ = 326°30’

Fore Bearing of BC = 68°30’

∠ABC = 360° - (326°30’- 68°30’) = 102° 

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