"Similarity of Figures" Similarity PPT Courseware 3

Description

"Similarity of Figures" Similarity PPT Courseware 3

learning target

1. Recognize the similarity of figures from examples of figures with the same shape in life and understand the concept of similar figures;

2. Understand the properties and judgment of similar figures.

Properties of similar polygons:

Corresponding angles of similar polygons are equal and the ratios of corresponding sides are equal.

How to judge similar polygons:

If two polygons satisfy that corresponding angles are equal and the ratios of corresponding sides are equal, then the two polygons are similar.

For four line segments a, b, c, d, if the ratio of two of the line segments (that is, the ratio of their lengths) is equal to the ratio of the other two line segments, such as a:b=c:d (that is, ad=bc), we The four line segments are said to be proportional line segments, or simply proportional line segments.

Practice in class

1. (Dehua High School Entrance Examination) Among the following groups of line segments (unit: �), the proportional line segment is ()

A.1,2,3,4 B.1,2,2,4

C.3, 5, 9, 13 D.1, 2, 2, 3

2. (Nanping·High School Entrance Examination) Among the following statements, which one is wrong ( )

A. Equilateral triangles are all similar B. Isosceles right triangles are all similar

C. The rectangles are all similar D. Squares are all similar

3. (Yantai High School Entrance Examination) In the hand-making class, Xiaohong used some scraps of floral fabrics, cut them and decorated them with hand-painted paintings. The following four patterns are hollow scalene triangles, equilateral triangles, squares and rectangular flowers she cut out. Border, in which the width of each pattern lace is equal, then the geometric figures enclosed by the inner and outer edges of the lace in each pattern are not similar ( )

Summary of this lesson

1. What have you gained from studying this class?

2. What question would you like to explore further?

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For more information about the "Similarity of Similar Figures" PPT courseware, please click the Similar ppt tag of similar ppt graphics.

"Similarity of Figures" Similarity PPT Courseware 2:

"Similarity of Figures" Similarity PPT Courseware 2 Teaching Objectives Knowledge and Ability Perceive the application of similar graphics in reality. Recognize shapes with the same shape. Understand the basic connotation of similar graphics. Process and methods: Understand the process of similar graphics through observation and operation. ..

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Update Time: 2024-11-19

This template belongs to Mathematics courseware People's Education Press Ninth Grade Mathematics Volume 2 industry PPT template

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