《梯形的中位线》说课教案(国外英语资料).docVIP

《梯形的中位线》说课教案(国外英语资料) Ladder middle line lesson lesson plan Jiaozuo twenty-third middle school Kang Pei The ladder median line is the teaching content of the nine year compulsory education, three year system, junior middle school geometry, second volumes, fourth chapters and eleventh sections. Below, I will explain the teaching design of this lesson from four aspects. I. Analysis of teaching materials: 1, the status and role of teaching materials: In this lesson, we study the ladder shaped middle line, which is based on the middle line of the triangle which the students have learned. It is one of the key parts of this chapter. Studying and mastering the concepts and properties of the middle line of trapezoid will help to improve students ability to solve some computational problems in quadrilateral, to prove problems and practical problems. In addition, through the teaching of this class, students can be permeated with analogy and transformation of mathematical thinking, to improve students ability to analyze and solve problems. Therefore, this lesson plays a very important role both in the study of knowledge and in the cultivation of students abilities. 2, teaching heavy and difficult: (1) emphasis: the concept and theorem of trapezoid median line; (2) difficulty: the thought and method of finding and demonstrating the theorem of middle line of trapezoid. The key to break through the difficulties is to improve the students cognitive level on the basis of enriching students perceptual knowledge in the process of reproducing knowledge and using the ideas and methods of mathematical transformation. The course of inquiry and grouping discussed in this class is to enable students to find the nature of ladder median line under the guidance of teachers, and to reasonably add auxiliary line proving theorem. Two, teaching objectives: According to the requirements of the new syllabus and quality education, combined with the content of teaching and the cognitive level of stud