Determine the R.L of a church spire at C from the following observations taken from two stations A and B(not in same plane), 50 m apart.
∠ BAC = 60o, ∠ABC = 50o .
The angle of elevation to the top of the spire from B = 29o. staff reading on a BM of RL = 25.0 m from A and B are respectively, 2.5 m and 0.50 m.
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