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《认识图形(二)——平面图形》是人教版一年级下册第一单元《认识图形(二)》中的教学内容。它属于“空间与图形”学习领域的起始教学内容。在教学本节课之前,学生已经认识了长方体、正方体、圆柱和球四种简单的立体图形,教材先通过立体图形引入平面图形,再从众多不同的平面图形中分类、概括、抽象出不同的平面图形的一般特征,形成平面图形的表象,并能辨认,为学生进一步学习平面图形的特征打下基础。学生在上册已经初步认识了长方体、正方体、圆柱和球这四
“Cognitive graphics (B) - Plane graphics” is the teaching content in the first unit of the second edition of the PEP (Cognitive Graphics II). It belongs to the initial teaching of “Space and Graphics” learning. Before teaching this lesson, the students have already learned four kinds of simple three-dimensional figures of cuboid, cube, cylinder and ball. The teaching materials first introduce the three-dimensional graphic into the graphic and then classify, summarize and abstract the different graphic The general characteristics of a planar graphic form the appearance of a planar graphic and recognize it, laying the groundwork for students to further study the features of a planar graphic. Students in the first book has been a preliminary understanding of the cuboid, cube, cylinder and the ball of these four