Example 2: A survey line BAC crosses a river, A and C being on the near and opposite banks respectively. A perpendicular AD, 40 m long, is set out at A. If the bearings of AL and DC are 48°30' and 288°30' respectively, draw the sketch and find the bearing o the chain line BAC and also the chainage of C when that of A is 207.8 m.

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