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設正方形的邊長為a,則a^2=14,則其外接圓的半徑為r=(√2)a/2,(外接圓的直徑等於正方形的對角線長);所以圓的面積=π*r^2=π*14/2=7π
圓的直徑是√60釐米 面積是=3.14*(√60)^2÷4=47.1平方釐米
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