$\fbox{[Toan-5] Hinh-Hoc}$

S

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Vì $4 \times 4=16$ cạnh của hình vuông là $4cm$

$\rightarrow$ $AE=4:2=2(cm) \\ AF=4:2=2(cm)$

$\rightarrow$ $S_{\Delta AEF}=\dfrac{2 \times 2}{2}=2(cm^2) \\
S_{\Delta BCD}=\dfrac{4 \times 4}{2}=8(cm^2)$

$\rightarrow S_{EBDF}=16-2-8=6(cm^2)$

 
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