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خطا

$D\Rightarrow \left. \begin{matrix}    HC=8-5=3  \\    DH=AB=4  \\ \end{matrix} \right\}\Rightarrow {{4}^{2}}+{{3}^{2}}=D{{C}^{2}}$  $16+9=D{{C}^{2}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,25=D{{C}^{2}}\Rightarrow DC=\sqrt{25}=5$