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一、教材分析《镜子改变了什么》这一节,是在学习了轴对称图形和轴对称的性质之后,要求学生通过赏析观察、探索思考,自己探索物体的镜面对称的规律,对学生的动手操作、探索归纳能力要求比较高。纵观第七章的教材安排,从生活中的轴对称现象入手,研究了简单轴对称图形的特点,归纳出图形轴对称的性质,然后通过《镜子改变了什么》这一节将二维的轴对称扩充到三维的镜面对称,加深学生的理解,发展学生的空间观念。
First, the textbook analysis, “What the mirror changed,” this section, after learning the axisymmetric graphics and axisymmetric nature, requires students to observe, explore and explore, to explore their own mirror symmetry of the law, the students hands Operation, exploration and induction of higher capacity requirements. Throughout the seventh chapter of the textbook arrangement, start from the axisymmetric phenomenon in life, study the characteristics of simple axisymmetric graphics, inducing the axisymmetric properties of the graphics, and then through the “mirror to change what” this section will be two-dimensional Axis symmetry extended to three-dimensional mirror symmetry, deepen the understanding of students, the development of students space concept.