Question: Two triangular stations A& B are 4 2 km apart & have elevations of 2 7 9 & 2 7 6 m respectively. Find the

Two triangular stations A& B are 42 km apart & have elevations of 279 & 276 m respectively. Find the minimum height of signal required at B so that the line of sight may not pan nearer the ground than 3m. The intervening ground may be around to have uniform elevation 252m.

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