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The correction to be applied to each 30 metre chain length along θ° slope, is

30 (sec θ - 1) m
30 (sin θ - 1) m
30 (cos θ - 1) m
30 (tan θ - 1) m
30 (cot θ - 1) m.

Correct Answer: 30 (sec θ - 1) m

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