图形的相似与(国外英文资料).doc

图形的相似与(国外英文资料) By reading guomuchengsong to, most are not good. - Zheng Banqiao Similarity and congruence of Graphs Zhang Jianliang Experimental Middle School of Changshou City [curriculum requirements] 1, graphic similarity (1) to understand the basic nature of the proportion, to understand the ratio of line segments, proportional line segments, will determine whether the known line segments are proportional. Through the construction, art examples to understand the golden section (2) recognize the similarity of graphs through specific examples, and explore the properties of similar graphs, knowing that the corresponding angles of similar polygons are equal, and the corresponding sides are proportional. The ratio of the area is equal to the square of the corresponding edge ratio (3) understanding the concept of similarity between two triangles, and exploring the similarity conditions and their main properties of two triangles (4) understand the graphics homothetic, can use a graphical homothetic zoom in or out. (5) observing and understanding the similarity of objects in real life through typical examples, and solving some practical problems by using the similarity of graphs (such as using the height of a flagpole by similarity measurements) (6) a proper coordinate system can be established to describe the position of the object change. It can flexibly determine the position of the object in different ways (7) in the same Cartesian coordinate system, we can feel the change of coordinate of the points after the transformation of the graph 2, graphic congruence (1) to understand the concept of graphic congruence, to know the concept of congruent graphics to identify congruent graphics; to know the corresponding edges and corresponding angles of congruent figures, and to solve some simple problems by using the congruence of Graphs (2) through the identification method of congruent triangles (two if the three sides of the triangle were equal, the two triangles congruent