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在小学几何知识教学中,几何形体的计算主要包括周长、面积和体积。本文分别介绍如下: 一、周长的计算 多边形各边长度的总和,叫做多边形的周长。计算周长的图形,教材中着重研究了长方形、正方形和圆。长方形、正方形的周长公式就是由周长的定义和长方形、正方形的特征直接推导出来的。圆的周长这一概念学生比较难理解,其严格定义应为:圆内接n边形当n趋于无穷大时,其周长的极限称作圆周长。讲述时,当然不能这样讲。除按课本中把圆形纸片在米尺上滚动一周量取长度的方法外,还可把用铁丝围成的圆剪断
In the elementary geometry teaching, the calculation of the geometric body mainly includes the circumference, the area and the volume. This article describes the following: First, the calculation of the length of each polygon perimeter length, called polygons perimeter. Calculation of perimeter graphics, textbooks focused on the rectangular, square and circle. Rectangular, square perimeter formula is defined by the perimeter and rectangular, square features directly derived. The concept of circle perimeter students more difficult to understand, its strict definition should be: Circular n-connected polygons When n tends to infinity, the limit of its perimeter known as the circumference of the circle. Of course, we can not say that when we talk about it. In addition to press the textbook round paper in the ruler to measure the length of a way to measure the length, but also can cut into a circle with wire cut