一、教学内容 :义务教育六年制小学数学第八册《三角形的认识》。二、教学目标 :1 使学生理解三角形的意义 ,掌握三角形的特征和特性 ,能按角的不同给三角形分类。2 通过学习 ,培养学生初步的观察、比较、概括、探索未知和创造的能力。三、教学设计与评析(一)联系生活、课前调 First, the teaching content: compulsory education six years of elementary mathematics eighth volume “understanding of the triangle.” Second, the teaching objectives: 1 to enable students to understand the meaning of the triangle, grasp the characteristics and characteristics of the triangle, according to the different angles to the triangle classification. 2 Through learning, students develop initial observations, compare, summarize, and explore the unknown and the ability to create. Third, teaching design and evaluation (A) contact life, before class transfer