Ta có: 

$\widehat{B}=\widehat{D}$$\left.\begin{matrix}\\\\\end{matrix}\right\} ⇒\widehat{A}=\widehat{E}$
$\widehat{C}=\widehat{F}$ 
$⇒\triangle ABC = \triangle DEF$

Ta có:

$HY=OT$

$HK=OG$      $\left.\begin{matrix}\\\\\end{matrix}\right\}⇒\triangle HKI = \triangle OGT$

$KI=GT$

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