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?????? | ??? meCalculator
...?????????????????????????????????????????????? ???=??x??x???? (~3.14159)=??x??x???? (~3.14159)÷4?...
https://www.mecalculator.tw/zh-tw/calculators/area/circle
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https://zh.m.wikipedia.org/zh-tw/%E5%9C%86%E7%9A%84%E9%9D%A2%E7%A7%AF
???????? - ?????? - Sci-pursuit
...?????????????????×??×3.14???????????? ?????S = ?r^2 ?????? ????????????????????????????????? ???????????????????????...
https://sci-pursuit.com/math/surface-area-of-circle.html
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...????? ??? 2 (cm)?????????????? ??????? 3.14????? ??????????? ???? = = ?? × × ?? × × ??? ????????? S S ???? S = 2 × 2 × 3.14 = 12.56 (cm2) S = 2 × 2 × 3.14 = 12.56 (c m 2)...
https://medemanabu.net/sansu/area-circle/
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...?????????????????????????? ????=???×?????? ????????S=?R2??????????????????3.141592654?r??????????? ???????S=1/4*?d2???d???????...
https://baike.baidu.com/item/%E5%9C%86%E9%9D%A2%E7%A7%AF%E5%85%AC%E5%BC%8F/3117177
???????? - ????
...???????????????????????????????????????????????????????????? ??? ?? ??? ????????????? ?? = ? * ?? 2? ???????????????????3.14159?...
https://eggrollup.cc/%e5%9c%93%e9%9d%a2%e7%a9%8d%e5%a6%82%e4%bd%95%e8%a8%88%e7%ae%97%ef%bc%9f/
?????? - Calculation Assistant
...?????? ??????????????????? ??: A = ? r2...
https://www.calculationassistant.com/cht/math/circle
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...??????????????????? ?????????????????????2?R???? ???????????????...
https://www.newton.com.tw/wiki/%E5%9C%93%E9%9D%A2%E7%A9%8D%E5%85%AC%E5%BC%8F
????? | Calculators.hk
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https://calculators.hk/%E5%9C%93%E5%BD%A2%E8%A8%88%E7%AE%97%E5%99%A8/
??????????,????? - ?????
...????L=2?r???r??????????????????3.14???????????*???????????????S=?r²?S=?* (d/2)²?...
https://www.52jisuan.com/article/gongshi_2024101275.html
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