thank you~

来源：学生作业帮助网编辑：作业帮时间：2024/04/28 05:36:22

thank you~
thank you~

thank you~
图1有两个半径为r的圆,其周长为：c1=2*2*PI*r=4PIr（PI为圆周率）
图2的周长为c2=2*PI*r+2*PI*r/2+2*PI*r/3+2*PI*r/6=4PIr
两种方案的材料一样多

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