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例1 设湖岸 MN 为一条直线,有一艘小船自岸边的A点与湖岸成α=30°匀速向湖中驶去,有一个人自 A 点同时出发,他先沿岸走一段路程
Example 1 Let the lakeshore bank MN be a straight line, and a boat from the shore point A and the lake bank should be at a uniform speed of α=30°, and one person will start at point A at the same time. He will walk a little distance along the coast.