《图形的相似》的教学分析与建议(国外英语资料).docVIP

《图形的相似》的教学分析与建议(国外英语资料) Birds want to fly high, flutter first, people seek progress, first read. - Li Kuchan The teaching analysis and suggestion of figure similarity Guangzhou Xiguan foreign language school Chen Yufeng I. requirements of the new curriculum standards: Understand the basic nature of the proportion, understand the ratio of line segments, proportional line segments, through the construction and art examples to understand the golden section. Second, we recognize the similarity of graphs through specific examples, and explore the properties of similar graphs. We know that the corresponding angles of similar polygons are equal, and the corresponding sides are proportional. The ratio of area is equal to the square of the corresponding edge ratio. Understand the similar concepts of two triangles, and explore the similar conditions of two triangles. The understanding of graphics homothetic, can use a graphical homothetic zoom. Typical examples are used to observe and understand the similarity of objects in real life, and some practical problems are solved by using the similarity of graphs (such as measuring height of flagpole by similarity). Two, class arrangement This chapter takes approximately 14 hours of teaching (in accordance with the recommendations of teaching), distributed as follows: Section 24.1 similar graphics -----------------1 class Section 24.2 of the similarity graph properties of the -----------2 class Section 24.3 similar triangles -----------------4 class Section 24.4 bit line ---------------------2 hours Section 24.5 painting similar graphics -----------------1 class Section 24.6 graphics and coordinate -----------------2 hours Review the ------------------------------2 class Three, the main features L. introduces mathematical content from practical problems. By analyzing and solving practical problems, the paper draws a conclusion, recognizing the features and properties of similar graphs, so that students can fully feel the connection