（09 年聊城一模文）已知米粒等可能地落入如图所示的四边形ABCD内

（09 年聊城一模文）已知米粒等可能地落入如图所示的四边形ABCD内，如果通过大量的实验发现米粒落入内的频率稳定在附近，那么点A和点C到直线BD的距离之比约为。

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（09 年聊城一模文）已知米粒等可能地落入如图所示的四边形ABCD内

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