如图 连接AO并延长,于DC交于点R,于BC的延长线交于点S,若AD=4,∠DCB=60°,BS=10求AS和OR四边形ABCD是菱形
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![如图 连接AO并延长,于DC交于点R,于BC的延长线交于点S,若AD=4,∠DCB=60°,BS=10求AS和OR四边形ABCD是菱形](/uploads/image/z/12457248-24-8.jpg?t=%E5%A6%82%E5%9B%BE+%E8%BF%9E%E6%8E%A5AO%E5%B9%B6%E5%BB%B6%E9%95%BF%2C%E4%BA%8EDC%E4%BA%A4%E4%BA%8E%E7%82%B9R%2C%E4%BA%8EBC%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%A4%E4%BA%8E%E7%82%B9S%2C%E8%8B%A5AD%EF%BC%9D4%2C%E2%88%A0DCB%EF%BC%9D60%C2%B0%2CBS%EF%BC%9D10%E6%B1%82AS%E5%92%8COR%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E6%98%AF%E8%8F%B1%E5%BD%A2)
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