Civil Engineering MCQAE Level Civil Engineering
For a survey line AB, if the fore bearing (WCB, Whole Circle Bearing) is 110 degrees, the back bearing is:
SurveyingFore and Back BearingMEDIUM
Choose the correct answer
A
290 degrees
B
70 degrees
C
110 degrees minus 180 = -70 degrees
D
250 degrees
Correct Answer
A. 290 degrees
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Back bearing = Fore bearing + 180 degrees (if FB < 180) OR Fore bearing - 180 degrees (if FB > 180). Here FB = 110 < 180, so BB = 110 + 180 = 290 degrees (WCB). In Reduced Bearing (Quadrant): FB = S70 deg E; BB = N70 deg W.
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