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纵观2012年全国各地的中考数学试题,圆仍是各地区试题考查的重头戏之一,其中尤以“直线和圆的位置关系”的知识点考查为重中之重.“直线和圆的位置关系”包括:直线和圆的三种位置关系;切线的性质和判定;三角形内切圆;切线长等相关知识点.下面就略举几例加以分析说明:
Throughout the 2012 national mathematics test questions around the country, the circle is still one of the highlights of examinations in various regions, of which “knowledge of the relationship between the position of a straight line and a circle ” is the most important test. “ Round position relationship ”includes: three kinds of linear and circular position relationship; the nature of the tangent and judgment; triangle inscribed circle; tangent length and other related knowledge points .A few examples to be analyzed below: