Grade 9, prepare for the high school entrance examination, learn the three levels of similar triangles

2022-05-03 0 By

The first level, prepare A similar model 1. Model 1, A type A type similar A type similar, often test the choice to fill in the blank, relatively simple.2. Model two, 8 type and anti 8 type similar 8 type and anti 8 type similar 8 type, common in the examination questions, general and model a comprehensive examination.3. Model 3, common Angle model (child and parent type) Child and parent similar model has common Angle, should think of child and parent similar model.4. Models four and three vertically similar models Three vertically similar models, often need to build their own.5. Model five, hand in hand model hand in hand similar model such similarity generally examine dynamic problems.The linear trisometrical similarity model uses the sum principle of triangle outer angles to prove equal angles, which needs attention.Quadrilateral similar model Quadrilateral similar model Quadrilateral similar model quadrilateral similar modelIn recent years, the center of gravity has gradually become more and more.The key is to construct parallel lines.The second level: must be two books do not have theorems projective theorem: projective theorem projective theorem in the projective theorem three product equations need to be memorized, you can search the relevant video to see, there are memory skills.Round power theorem: round power theorem I in the “miss match with you over winter vacation: ninth grade, prepare for the entrance examination, round string tangent theorem, round power theorem” has a detailed description, here is no longer repeated.The third level, want to know similar triangle answer the last axis of the examination method first: similar triangle existence problem this kind of problem is often combined with quadratic function, commonly used thinking method only one kind.I have a detailed explanation in “Miss Match with you over winter vacation: grade nine, prepare for the entrance examination, the existence of similar triangles in the quadratic function”, here will not be repeated.Secondly, the similarity of line segment proportion and area proportion in function mainly brings about proportion problem, which is worth thinking and studying.I am in the “match teacher with you over the winter vacation: grade nine, prepare for the mid-term examination, quadratic function in the proportion of the line problem”, “match teacher with you over the winter vacation: grade nine, prepare for the mid-term examination, quadratic function in the area of the proportional problem” to be detailed, here is not repeated.Third: The problem of Abdelhamid circle is really know the problem is easy to do, do not know, do the problem is more difficult.I have a detailed explanation in “Match teacher accompany you over winter vacation: ninth grade, prepare for the entrance examination, Ah’s circle problem”, which is not repeated here.Conclusion Teacher Sai will take you to have a full winter vacation.How to prepare for the exam?Welcome to watch teacher Contest video collection for free (Teacher Contest has more than 500 free, systematic review videos for the high school entrance examination)