10.
如图,点\(A\)、\(B\)在\(x\)轴、\(y\)轴上,\(OA\)\(=\)\(OB\),点\(C\)为\(AB\)的中点,\(AB\)\(=12\sqrt{2}\).
![](https://www.ebk.net.cn/tikuimages/2/2017/300/shoutiniao38/8c9840226b6fba77d17751b6f6676974.png)
\((1)\)求点\(C\)的坐标;
\((2)\)\(E\)、\(F\)分别为\(OA\)上的动点,且\(∠\)\(ECF\)\(=45^{\circ}\),求证:\(EF\)\({\,\!}^{2}=\)\(OE\)\({\,\!}^{2}+\)\(AF\)\({\,\!}^{2}\);
\((3)\)在\((2)\)的条件下,若点\(E\)的坐标为\((3,0)\),求\(CF\)的长.