6《余角和补角》的教学设计（The teaching design of 6 and the supplementary angle）.docVIP

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6《余角和补角》的教学设计（The teaching design of 6 and the supplementary angle）.doc

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6《余角和补角》的教学设计（The teaching design of 6 and the supplementary angle）

6《余角和补角》的教学设计（The teaching design of 6 and the supplementary angle） Subject , supplementary angle The seven chapter of third grade fourth Designer Cengxianlan Teaching analysis Teaching objectives: 1, understanding, supplementary angle, will ask the known angle, angle. 2, grasp the nature of coangle, supplementary, will carry out the relevant calculation. 3, learn simple reasoning Key points: Teaching emphasis: the concept and nature of complementary, complementary angle. Teaching difficulties: correct judgment of complementary, complementary angle and degree calculated by algebraic method angle. Analysis of teaching materials: Coangle and peoples education preliminary knowledge supplementary graphic version of the seven grade two important basic concepts in this chapter. Comparison of measurement and the size of the students in front of diagonal learning, have a certain foundation for learning and playing together through the exploration of the nature of angle, angle and supplementary learning, for the future that is equal to the angle provides a basis and method. Teaching equipment Multimedia projector, physical props design idea The main teaching design The concept of this section by the geometry angle and introducing supplementary, and then through the activities of exploring angle method and summarizes the property angle, and by analogy to explore the supplementary nature, so that students can use these properties to solve the problem. teaching process Teacher activity A: (1) in a triangular ruler, each has an angle is 90 degrees, then the remaining two corners and is _______. (2) cut a rectangular (triangular), cut into two corners with scissors. Summary: if the two acute angle and a right angle (90 degrees), we say that the two complementary angle angle, referred to as complementary, but also can be said to one of the corners is another angle. 1 / 2 cases of angle and complementary angle, angle is 1 / 2 / 2 / 1 angle, is the angle. Activity two: 1, ask the st