认识四边形教学片段:1.摸一摸。课件:圆、三角形消失,剩下长方形和正方形。师:圆和三角形都去玩了,剩下了长方形和正方形。它们说:“告诉大家一个小秘密,我们还有一个同样的名字呢?你们能猜到吗?”学生猜。生:我猜叫四边形。师:为什么这样猜呢?生:因为它们有4条边。讲述:哦,你们觉得它有4条边,所以叫四边形。那哪里是它的4条边?你愿意上台摸一摸、数一数吗(请学生上台摸一摸、数一数)?师:刚才这个同学沿四周摸到的一条条线 Understand the quadrilateral teaching fragment: 1. Touch. Courseware: circle, triangle disappears, the remaining rectangular and square. Teacher: Both circles and triangles go play, with rectangles and squares left. They say: “Tell you a little secret, do we have another one with the same name? Can you guess?” Student guess. Health: I guess the quadrilateral. Teacher: Why do you guess this? Health: Because they have 4 sides. Narrative: Oh, you think it has four sides, so called quadrilateral. Where are the four sides of it? Are you willing to step onto the stage to touch it and count it? (Please feel free to contact the students!) Teacher: Just a line touched by this classmate