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通过今天的数学课,我不仅知道了什么是周长,还学会了怎样正确计算长方形和正方形的周长。课后我和小伙伴们都非常好奇学校长方形操场的一周有多长,于是大伙儿就商量着来到操场上,齐心协力地用卷尺测量出了操场的长和宽,最后我们根据长方形周长=(长+宽)×2,顺利地算出了操场的周长。但是在独立做作业时,我却碰到了这样一道题:把一张长方形纸对折,正好得到两个边长为2分米的正方形。这张长方形纸的周长是
With today’s math class, I not only learned what a perimeter, but also learned how to correctly calculate the perimeter of a rectangle and a square. After class and my companions are very curious how long the school rectangular playground a week, so everyone on the playground came to discuss, make concerted efforts to measure the length and width of the playground with a tape measure, and finally we according to the rectangular perimeter = (Length + width) × 2, the circumference of the playground is calculated smoothly. However, when I was doing my homework independently, I encountered the problem of folding a piece of rectangular paper two times to get exactly two squares of two decibels each. The circumference of this rectangular paper is