一个正方形和一个圆的周长相等,正方形的边长是3.14厘米,求圆的面积。
3.14×4÷3.14÷2=2(厘米),3.14×22=12.56(平方厘米)
Read and rearrange.(为下列句子排序,使之成为一段通顺的对话)
( )Yes. How much is this sweater?
( )Can I help you?
( )It's one hundred and ninety-eight yuan.
( )That's expensive.
Pipelines are not ()
A. labor-intensive
B. capital-intensive
C. tech-intensive
D. low cost and high return