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教学目标 1.理解掌握三角形的慨念。 2.掌握三角形的特征与特性。 3.清楚三角形按内角特点分类的方法,掌握锐角
Teaching Objectives 1. Understand grasp the concept of the triangle. 2. master the characteristics and characteristics of the triangle. 3. Clear triangle according to the characteristics of the classification of the angle, the acute angle