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教学内容《九年义务教育小学数学》第八册129～131页内容。教学目标1.使学生直观了解三角形内角和是180°,会运用这一规律求三角形中的未知角。2.在引导学生发现这一规律的过程中,培养学生猜测、动手操作和初步的归纳、推理的能力。教学过程一、复习旧知,激趣引入1.师手举彩色
Teaching Content “Nine-year compulsory primary school mathematics,” the eighth book 129 ~ 131 pages content. Teaching Objectives 1. To enable students to intuitively understand the internal angle and the triangle is 180 °, will use this law to find the unknown angle in the triangle. 2. In guiding students to discover this law in the process of training students to guess, hands-on operation and initial induction, reasoning ability. Teaching process First, review the old knowledge, interesting introduction 1. Teachers hand color