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《轴对称》一章是初中数学“空间与图形”之“图形变换”中的重要内容,有关的题型也是中考的热点.轴对称图形的定义和性质是中考的常考点,常以选择题的形式出现.等腰三角形的概念、性质、判定是中考必考内容,在填空题、选择题、解答题中均有出现,等边三角形和线段的垂直平分线在中考中也时常考查.这部分试题的难度不大,以中低档题为主,约占总分值的5%～10%.一课程标准解读1.了解轴对称、轴对称图形的定义,理解轴对称的基本性质.2.能够按照要求作出简单图形经过一次或两次轴对称变换后的图形;认识和欣赏轴对称在现实生活中的应用,能利用轴对称进行简单的图案设计.3.了解线段垂直平分线的概念,并掌握其性质;
The chapter “Axisymmetry” is an important part of “Graphics Transformation” of junior high school mathematics “Space and Graphics ”, and the related questions are also the hot spots of the senior high school entrance examination.The definition and nature of the axisymmetric graphics are the usual test points of the senior high school entrance examination, Often appear in the form of multiple-choice questions. Isosceles triangle concept, nature, determine the content of the exam will fill in the blank, multiple-choice questions, answer questions have emerged, equilateral triangles and vertical bisector of the line This part of the questions is not difficult, to low middle questions, accounting for about 5% ~ 10% of the total score. A course standard interpretation 1 understanding of axisymmetric, axisymmetric graphics, the definition of axisymmetric The basic nature of .2 can be made in accordance with the requirements of simple graphics after one or two axisymmetric transform graphics; understanding and appreciation of the application of axisymmetric in real life, the use of axisymmetric simple pattern design.3 understanding of the vertical line segment Bisect the concept of the line, and grasp its nature;