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2018_2019学年高中数学第四章圆与方程4.2.1直线与圆的位置关系情境导学素材新人教A版必修2.doc

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14.2.1 直线与圆的位置关系【情境导学】“大漠孤烟直,长河落日圆”是唐朝诗人王维的诗句,它描述了黄昏日落时分塞外特有的景象.如果我们把太阳看成一个圆,地平线看成一条直线,观察下面三幅太阳落山的图片.(1)在太阳的下落过程中,取如实例中的处位置,直线与圆的公共点的个数是怎样的?(无公共点、一个公共点、两个公共点)(2)图片中,地平线与太阳的位置关系怎样?(相离 相切 相交)

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