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The horizontal angle subtended at the theodolite station by a subtense bar with vanes 3 m apart is 0o 10 ′40′′. Calculate the horizontal distance between the theodolite and the subtense bar?

The horizontal angle subtended at the theodolite station by a subtense bar with vanes 3 m apart is 0o 10 ′40′′. Calculate the horizontal distance between the theodolite and the subtense bar? Correct Answer 966.87 m

Use from the geometry, D=1/2 x s x cot α/2, where, s = the distance between the targets of subtense bar, and α = apex angle subtended by targets at O. As α is small tan α/2 = α/2, D = s/α.

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