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【教学目标】1.经历在较复杂的图形中寻找面积相等的三角形的活动,强化平行线、巩固基本概念,提高学生观察图形和分析图形的能力,发展空间观念。2.引导学生对图形进行灵活的分析、割补以及各种变换,提高思维的灵活性和逻辑性。【教学过程】一、初步发现规律师:老师在一个边长是8厘米的正方形中画了这样一个三角形。谁来说说这个三角形的信息?生:这个三角形的底和高都是8厘米。生:这是一个直角三角形,BC为底,AB就是高。如果以
Teaching Objectives 1. Experience in the more complex graphics to find triangular area of equal activity, strengthen the parallel lines, consolidate the basic concepts, improve students’ ability to observe graphics and analyze graphics, the development of space concepts. 2. Guide students to analyze the graphics flexible, cut and transform, to improve the flexibility and logic of thinking. [Teaching process] First, the initial discovery lawyers: the teacher in a side length of 8 cm square draw such a triangle. Who said the information about this triangle? Students: The bottom of the triangle and high are 8 cm. Students: This is a right-angled triangle, BC is the end, AB is high. If so