Question: In trigonometric leveling from point A to point B , the slope distance and zenith angle measured at A were 7 9 2 9 .

In trigonometric leveling from point A to point B, the slope distance and zenith angle measured
at A were 7929.464 m and 88\deg 4550. At B these measurements were 7929.473 m and
91\deg 1716, respectively. If the instrument and rod target heights were equal, calculate the
difference in elevation from A to B (3 decimal places).

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