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长方形的认识,对以后的几何形体知识教学有重要作用。为让学生较好地认识长方形,教学中应多引导他们参加实践活动,并加强对各种图形的抽象、比较工作。教学程序可作如下安排:一、直观、操作。分两步进行:1.初步直观。要学生看桌子、黑板、书本、讲台的表面,问各有几个角?哪些角是直角?(黑板面的角,教师可用大三角板量给学生看。桌面、
Rectangular understanding of the geometric knowledge of the future teaching has an important role. In order to enable students to better understand the rectangle, teaching should guide them to participate in more practical activities, and to strengthen the abstraction of various graphics, more work. Teaching procedures can be arranged as follows: First, visual, operational. In two steps: 1. Preliminary intuitive. Ask the students to look at the surface of the table, blackboard, books, podiums and ask how many corners are there and what angles are right angles? (The angle of the blackboard,