如圖,BE是直徑,角BCD=45度,所以角DCE=45度,即DE=CD=1
BE=sqrt(BC^2+CE^2)=sqrt(34) (或用 sqrt(AB^2+AE^2))
如圖,BE是直徑,角BCD=45度,所以角DCE=45度,即DE=CD=1
BE=sqrt(BC^2+CE^2)=sqrt(34) (或用 sqrt(AB^2+AE^2))
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