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如图,在菱形
参考答案:证明:\(\because \)四边形\(ABCD\)是菱形,\(\therefore AB = AD = BC = CD\),\(\angle B = \angle D\),在\(\Delta ABE\)和\(\Delta ADF\)中,\(\left\{ {\begin{array}{*{20}{l}}
{\angle BAE = \angle DAF} \\
{AB = AD} \\
{\angle B = \angle D}
\end{array}} \right.\),\(\therefore \Delta ABE \cong \Delta ADF(ASA)\),\(\therefore BE = DF\),\(\therefore BC - BE = CD - DF\),即\(CE = CF\)。