May 2021 5 60 Report
這題圓周題目不懂,請幫幫我!

http://a367.yahoofs.com/hkblog/rDkOb8SWERnmmaR4UeT...

我可能畫的不太好,但都請幫幫我!

Update:

9cm是指斜邊

Update 3:

周界是求這圖形外邊的長度

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