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一次听课,见一位教师讲角概念的教学过程是: 复习直线、线段并引进射线概念后,教师先向学生提供顶点和两条边较明显的角,如角尺、圆规等;再向学生提供两条边不太明显的角,如三角板、五角星、扇面等。边让学生观察,边说明这就是角。接着,要求学生列举生活中所看到的角,他们纷纷举出了桌面的角、张开的剪刀、红领巾、墙角、牛角、羊角……都是角。针对学生举出的例子,教师简要地说:“际们举出的例子大部份是对的,少数不正确。”
A lecture, see a teacher talk about the concept of teaching process is: Review of the line, line and the introduction of the concept of radiation, the teacher first to provide students with vertex and two more obvious corners, such as the square, compasses, etc .; Two sides are not obvious angle, such as set square, five-pointed star, fan and so on. While allowing students to observe, this shows that this is the corner. Next, students are asked to list the angles they see in life. They all list the angles of the desktop, scissors, scarves, corners, horns, horns ... all angles. According to the example given by the students, the teacher briefly states: “Most of the examples cited are mostly correct and a few are not correct.”