Question
Download Solution PDFBack bearing of a line is equal to
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Back Bearing of a Line
Back bearing is the direction measured from the endpoint of a line towards its starting point. It is the reverse of the fore bearing, with a 180° difference in azimuthal direction. This concept is crucial in surveying to determine the opposite direction of a traverse.
Analyzing the Given Options
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Option 1: Fore bearing ± 90° (Incorrect)
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Back bearing is always 180° from the fore bearing, not 90°.
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This option is mathematically incorrect for back bearing calculations.
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Option 2: Fore bearing ± 180° (Correct)
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Back bearing is calculated as the fore bearing ± 180° to account for the reverse direction.
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If the fore bearing is less than 180°, add 180°; if it is greater than 180°, subtract 180°.
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Option 3: Fore bearing ± 360° (Incorrect)
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360° adjustment is unnecessary since bearings are measured within a 360° circle.
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This option is redundant and does not align with standard surveying practices.
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Option 4: Fore bearing ± 270° (Incorrect)
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270° adjustment is not a standard method for calculating back bearing.
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This option does not reflect the reverse direction of the line accurately.
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Conclusion: The correct answer is Option 2: Fore bearing ± 180°.
Last updated on Jul 12, 2025
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