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一、创设情境,理解边线1.创设情境理解封闭图形师:看,这节课老师又带来了一个数学小助手一根绳子,你打算怎样玩?生:翻绳、围图形师:你的想法和老师不谋而合,瞪大了眼睛仔细地看呦,看老师围成了什么图形?师:同学们拿出手指和老师一起来围一围,指一指。2.围图形师:现在是不是心里痒痒的,想不想自己也来围一个呢?用绳子在卡纸上围一个你喜欢的封闭图形,先想一想要围什么?心动不如行动,开始吧。
First, create the situation, understand the edge 1. Create a situation to understand Closed figure teacher: Look, this lesson teacher has brought a math assistant a rope, how do you intend to play? Health: leaning rope, Wai Graphic Division: your Ideas and teachers coincide, staring eyes carefully Yo, see the teacher surrounded by what graphics? Teacher: Students come up with the fingers and the teacher surrounded by a finger. 2. Wai Graphic Division: Now it is not the heart itch, do not want to yourself also surrounded by a? With a rope around the paper you like a closed image, first think about what to do? .