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初中数学八年级上册试题库(555题)


如图,线段\(AC\)\(BD\)相交于点\(E\),连接\(AB\)\(CD\),已知\(\angle A = \angle D = 90^\circ \)\(AC = BD\)

求证:\(BE = CE\)

图片 3



知识点:第十二章 全等三角形


参考答案:

证明:连接\(BC\),如图所示:

\(\because \angle A = \angle D = 90^\circ \)

\({\rm{Rt}}\Delta {\rm{ABC}}\)\({\rm{Rt}}\Delta {\rm{DCB}}\)中,

\(\left\{ {\begin{array}{*{20}{l}}
{AC = BD} \\
{BC = CB}
\end{array}} \right.\)

\(\therefore {\rm{Rt}}\Delta ABC \cong {\rm{Rt}}\Delta DCB(HL)\)

\(\therefore AB = DC\)

\(\Delta ABE\)\(\Delta DCE\)中,

\(\left\{ {\begin{array}{*{20}{l}}
\begin{gathered}
\angle A = \angle D \\
\angle AEB = \angle DEC \\
\end{gathered} \\
{AB = DC}
\end{array}} \right.\)

\(\therefore \Delta ABE \cong \Delta DCE(AAS)\)

\(\therefore BE = CE\)

 

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