Reflection on the surface area of cuboids
In the teaching of cuboid surface area, the introduction was of great significance. There were the following teaching reflections: ** I. Reflection on the necessity of expanding the cuboid again ** 1. ** From the perspective of knowledge and logic ** - The surface area was a part of the area category and was the object of study in plane geometry. The surface area of a three-dimensional figure could only be defined by the concept of area when it was transformed into a two-dimensional problem. For example, a cuboid was a three-dimensional figure, and its surface area was the sum of the areas of its faces, which were two-dimensional. In plane geometry, the premise of research was "on the same plane." Therefore, expanding a cuboid was a necessary method to transform a three-dimensional problem into a two-dimensional problem. This met the requirements of the logical construction of knowledge. 2. ** From the perspective of spatial ability cultivation ** - The conversion between three-dimensional space and two-dimensional space was an important part of spatial imagination. Most of the three-dimensional diagrams presented in the textbooks were "three-dimensional diagrams"(actually two-dimensional diagrams). The students 'ability to imagine three-dimensional space was reflected in making such diagrams "stand up." When learning solid geometry, the awareness and ability to "transform" was crucial. It was to transform a three-dimensional problem into a two-dimensional one. In the introduction of cuboid surface area teaching, the corresponding relationship between the three-dimensional figure and the planar unfolded figure was discussed, which could strengthen the connection between the surface and the body, help to cultivate the students 'transformation consciousness, and further develop their spatial imagination ability. ** II. Reflection on the "estimation" of teaching materials ** 1. ** From a practical perspective ** - In real-life scenarios such as making paper boxes, estimating the required materials was an inevitable problem. For example, to make a rectangular cardboard box, one had to consider how much cardboard was needed. This was a practical application problem that stemmed from life, so the arrangement of teaching materials was in line with life logic. 2. ** From the perspective of mathematical skills and awareness cultivation ** - The skill of estimation was an important mathematical skill, and the awareness of estimation was an important mathematical awareness. In the context of the new curriculum standard and the new curriculum, the emphasis on estimation has a significant improvement in traditional mathematics teaching. In the introduction situation of the cuboid surface area, such as "How much cardboard do I need to make the paper box? The "at least" here required the estimation to "go further", which could be multiplied by the area of the largest surface by 6, or the whole unfolding diagram could be regarded as a large rectangular part. This way, it would not be repeated with the later accurate calculation, but it could also cultivate the students 'estimation skills and awareness. ** 3. Reflection on the edge length data given by the cube figure (in the teaching situation of the cuboid surface area)** 1. ** From the perspective of mathematical logic strictness ** - When the topic was "Surface Area of a Cuboid", although the surface area of a cube was given as the application of the surface area of a cuboid in the "try", it could not be directly regarded as the "known" of the student. In the textbook, the edge length data (such as the three-dimensional data) was given for the cube figure to let the students start from the concept of "a cube is a special cuboid" and apply the cuboid surface area algorithm to calculate the surface area of the cube. For example, a cube with a certain edge length was transformed into a cuboid with equal length, width, and height (namely edge length). Then, the surface area calculation method of the cuboid was applied, and finally, the surface area formula of the cube was simplified. This was strictly mathematical. Read more exciting novels for free
Reflection and Analysis on the Observation Records of the Art Design Area in the kindergarten
The following are some of the main points of the observation records and analysis of the kindergarten art design area: ** I. Reflection on the purpose and significance of observation ** 1. ** Understanding Early Child Development ** - Through the observation and recording of children's activities in the art design area, one could understand the development level of children in artistic creation and craftsmanship. For example, whether the child's painting skills were at the simple doodling stage or could already describe more complicated object structures; in hand-making, the development of fine hand movements, such as the proficiency of using scissors, the ability to shape when kneading plasticine, and so on. - They could also observe the development of children's creativity and imagination. For example, children's unique use of color in painting may not follow the convention but be full of creativity, which reflects their unique imagination. 2. ** Guiding teaching strategies ** - Observation records could help teachers adjust their teaching strategies. If it is found that most children have a single composition when painting in the art design area, the teacher can add guidance on composition in the subsequent art courses, such as guiding the children to learn different composition forms, such as triangle composition, S-shaped composition, etc. - For the difficulties encountered by children in hand-making, such as unfamiliarity with the use of materials, teachers can adjust the way the materials are put in, add material introduction links or provide more level of materials to meet the needs of children at different levels of development. 3. ** Promotion of children's individual development ** - Every child's performance in the art design area was unique. Through observation records, teachers could find children who were more introverted and did not participate in art design activities, and then take individual guidance measures. For example, for children who are shy and dare not try new drawing tools, one-on-one encouragement and demonstration can be given to help them overcome psychological barriers. ** 2. Analysis of the observation content ** 1. ** Skill and Ability Development ** - ** Drawing Skill ** - Observe the child's use of lines when drawing, whether it is smooth or intermittent, whether the thickness of the lines changes consciously, etc. For example, a child could only draw simple straight lines and could gradually draw curves and broken lines. This was the development of line control. - In terms of color perception, whether children can accurately distinguish different colors and whether they start to try color matching. For example, some children would choose to use contrasting colors or neighboring colors to match from only using a single color to painting, reflecting the progress of their color cognition. - ** Handcraft ability ** - In terms of the use of tools, such as the use of scissors, whether the child could cut out simple shapes or could already carry out complicated paper-cutting creation. Whether the glue stick, glue, and other sticking tools could be used correctly, and whether the amount applied was appropriate. - The ability to sculpt by hand was also crucial. He observed whether the child could create basic shapes such as spheres and cylinders when he pinched the plasticine, and whether he could combine these shapes to create more complex objects, such as a small animal with a body and four limbs. 2. ** In terms of social and emotional aspects ** - ** Social interaction ** - In the art design area, there might be cooperation, sharing, or competition between children. For example, observe whether the child will actively share his drawing tools with his peers, such as lending his extra colored pens to other children. When working together to create a large-scale painting, how well did the children divide their work and cooperate with each other? Were they able to listen to the opinions of others? Were they more self-centered and insisted on their own ideas? - ** Emotional expression ** - Children's works were often a way to express their emotions. For example, if a child drew a picture of a family and the characters in the picture were all smiling, it might reflect the harmony and happiness of his family atmosphere. If the child was depressed during the painting process, it might be because he was dissatisfied with his work or encountered difficulties that could not be solved. 3. ** Attention and persistence ** - Observe the child's concentration when they are in the art design area. Some children may be able to focus on their own painting or craftsmanship for a long time, while others are easily disturbed by the surrounding environment and frequently change the content of the activity. - The perseverance of young children in the face of difficulties was also worthy of attention. For example, if the modeling failed, the child would choose to give up or continue to try to adjust. This reflected their perseverance and attitude towards solving problems. ** 3. Reflection on Observation Methods ** 1. ** The effectiveness of the blank record ** - The blank recording method was to truthfully record the behavior of the child in the art design area without adding too much subjective evaluation. This method could provide objective and true raw data. However, simple line drawing might ignore some hidden information, such as the emotional fluctuations that might exist behind the sudden change of the child's painting content. This required the teacher to carry out in-depth analysis and speculation on the basis of line drawing. 2. ** Combination of Regular and Random Observation ** - Regular observation could allow teachers to have a stage understanding of the development of children in the art district. For example, they could observe and record the children in the art district at a fixed time every week. However, random observation was also very important because it could capture the behavior of children in daily accidental situations. It might discover some special situations that were missed during regular observation or sudden inspirations of children. ** IV. Analysis of Teacher Guidance Strategy ** 1. ** The scale of timely guidance ** - In the art design area, teachers needed to grasp the scale of timely guidance. If the guidance was too timely, it might deprive the child of the opportunity to explore independently. For example, when a child tried to use a new painting material, the teacher immediately told him the correct way to use it, and the child lost the process of exploring by himself. However, if the instruction is too late, the child may lose interest in the art design activities because of the long-term frustration. For example, if a child was unable to solve a structural problem in the process of hand-making, the teacher might give up the work if he did not give appropriate hints in time. 2. ** The implementation of personalised guidance ** - According to the observation records, they would provide individual guidance according to the characteristics of different children. For children with artistic talent and rapid development, more challenging tasks or advanced materials could be provided. For example, children who were good at painting could be provided with more professional painting tools to encourage them to try more complex painting styles. As for children who developed slowly or lacked self-confidence, more encouragement and guidance on basic skills should be given. For children who did not dare to draw, teachers could guide them to draw simple shapes first to gradually build self-confidence. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Curved surface, curved surface, picture encyclopedia
Appear on the Surface
" Surfaced " was a contemporary urban spy drama. It told the story of the leak of the core technology of the new deep-sea submarine developed by the 301 Research Institute. In order to investigate and solve the case and protect national defense secrets and homeland security, the national security investigators Hong Shaoqiu and Ye Han set up a task force. In the process of handling the case, there were misunderstandings and hidden rivalries between Hong Shaoqiu and Ye Han, but as the investigation deepened, their relationship gradually broke. After experiencing the struggle between emotion and reason, they finally discovered the truth hidden in the deepest depths. Jin Dong and Han Yuqin were the leading actors in the drama.
Appears on the Surface
The cast list of the TV series " Surfaced " included Jin Dong, Han Yuqin, Wang Ziquan, Liu Li, Qi Kui, Li Yiyi, Wu Jinyan, and other leading actors.
Rise to the surface
The leading actors who surfaced included Gugu Mbata Lao, Oliver Jason Cohen, Stephen James, Ellie Grener, and Francois Arnold.
Cold on the surface
The following were the recommendations of the male protagonists in several ancient novels: " Princess Jiao and the Reckless Fuma "," Domineering Pet "," Ruan Ruan is not Soft "," A Contract, A Tyrannical President Is Too Dangerous "," The Brocade Journey "," The Demonic Face of a Prosperous Age "," As Beautiful as She "," The Emperor's Grace "," The Pagoda "," It's Hard for Cousin "," The Biography of Yingying "," The Blacksmith's Barbaric Wife "," My Lord Guard "," Brocade Clothes as Husband "," Huai Jiao "," Commoner "," Insist on Not Relaxing Qing "," Happy
The Surface Movie
The Surface was a 2016 Australia horror film directed by Tim Egan. The movie told the story of a female protagonist who found herself in danger after regaining consciousness. She used her broken limbs to explore the possibility of survival, but she was faced with an unclimbable cliff and a bottomless abyss. The director was inspired by his own personal experiences, including a serious car accident and a conversation with a depressed friend. The movie received a rating of 7.6 on Douban and had a good reputation. " Surface " was a horror movie that made people despair. Through the intense plot and the director's personal experience, it showed the fear of life and death and the instinct to survive.
Rise to the Surface
It was a 1996 film directed by Jim Wilson, with Harvey Kettle and Cameron Diaz as the stars. The story was about the famous judge George and his wife, Natalie, on a holiday on an island off the coast of Maine. Their good friend Lance and Natalie's ex-lover, Kent, also joined the trip. However, Kent was found dead next to Natalie one morning. In order to clear her name, Natalie decided to hide Kent's body and try to prove that she had nothing to do with him.
On the surface, reserved.
Reflection on Candle
Candle was a novel by Victor Hugo of France. It was about a wealthy businessman and his lover who lost all their property and lives in a fire. After the fire, the merchant's wife decided to use a candle that the merchant had donated to prove her love in order to make up for her loss, which triggered a series of story plots. The novel profoundly revealed the greed and selfishness of human nature and the harm of fire to people's lives and property. In the novel, the merchant's wife did not hesitate to deceive and use others in order to recover her loss, which eventually led to her own failure and death. This story tells us that wealth and material wealth do not represent a person's true value. True love and friendship should be built on the basis of sincerity and trust. The novel also talked about some moral and ethical issues. For example, if enough people were willing to sacrifice themselves to save others in a fire, the whole society would be more harmonious and safe. At the same time, the novel also emphasized the importance of family and love. Lovers should respect and care for each other instead of using and hurting each other. Candle is a novel full of philosophical and human thinking. Through the theme of fire, it profoundly reveals the nature of human greed and selfishness, and also emphasizes the importance of family and love. It provides some useful enlightenment for people to face moral and ethical problems in real life.