老哥们一道小学数学题求教

Monkey_Man-avatar

Monkey_Man

2020-08-13T15:17:46+00:00

外面的正十边形470cm2,里面的正五边形面积380cm2
求阴影面积
[img]https://img.nga.178.com/attachments/mon_202008/16/-7Q5-j21kK10T1kSfz-sg.jpg.medium.jpg[/img]