如图,南京绿博园中有一条人工河,河的两岸PQ、MN互相平行,河岸PQ上有一排间隔为50的彩柱C、D、E、……,某人在河岸MN的A处测得角DAN=21°,然后沿河岸走了175米到达B处,测得角CBN=45°,求这条河的
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![如图,南京绿博园中有一条人工河,河的两岸PQ、MN互相平行,河岸PQ上有一排间隔为50的彩柱C、D、E、……,某人在河岸MN的A处测得角DAN=21°,然后沿河岸走了175米到达B处,测得角CBN=45°,求这条河的](/uploads/image/z/4549050-18-0.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%8D%97%E4%BA%AC%E7%BB%BF%E5%8D%9A%E5%9B%AD%E4%B8%AD%E6%9C%89%E4%B8%80%E6%9D%A1%E4%BA%BA%E5%B7%A5%E6%B2%B3%2C%E6%B2%B3%E7%9A%84%E4%B8%A4%E5%B2%B8PQ%E3%80%81MN%E4%BA%92%E7%9B%B8%E5%B9%B3%E8%A1%8C%2C%E6%B2%B3%E5%B2%B8PQ%E4%B8%8A%E6%9C%89%E4%B8%80%E6%8E%92%E9%97%B4%E9%9A%94%E4%B8%BA50%E7%9A%84%E5%BD%A9%E6%9F%B1C%E3%80%81D%E3%80%81E%E3%80%81%E2%80%A6%E2%80%A6%2C%E6%9F%90%E4%BA%BA%E5%9C%A8%E6%B2%B3%E5%B2%B8MN%E7%9A%84A%E5%A4%84%E6%B5%8B%E5%BE%97%E8%A7%92DAN%3D21%C2%B0%2C%E7%84%B6%E5%90%8E%E6%B2%BF%E6%B2%B3%E5%B2%B8%E8%B5%B0%E4%BA%86175%E7%B1%B3%E5%88%B0%E8%BE%BEB%E5%A4%84%2C%E6%B5%8B%E5%BE%97%E8%A7%92CBN%3D45%C2%B0%2C%E6%B1%82%E8%BF%99%E6%9D%A1%E6%B2%B3%E7%9A%84)
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