Cho \(\Delta ABC\) và \(\Delta DEF\) có: \(\widehat B = \widehat {D;}\,\dfrac{{BA}}{{BC}} = \dfrac{{DE}}{{DF}}\), chọn kết luận đúng:

$\Delta BDC$

$\Delta CBD$

$\Delta BCD$

$\Delta DCB$

\(\Delta EDA \backsim \Delta ABC\)

\(\Delta ADE \backsim \Delta ABC\)          

\(\Delta AED \backsim \Delta ABC\)          

\(\Delta DEA \backsim \Delta ABC\)

$10\,cm$        

$12\,cm$        

$15\,cm$        

$9\,cm$

$\Delta BDC$

$\Delta CBD$

$\Delta BCD$

$\Delta DCB$

$\Delta BDC$

$\Delta CBD$

$\Delta BCD$

$\Delta DCB$

\(\widehat {ABE} = \widehat {ACD}\)

\(AE.CD = AD.BC\)

\(AE.CD = AD.BE\)  

\(AE.AC = AD.AB\)

\(\Delta EDA \backsim \Delta ABC\)

\(\Delta ADE \backsim \Delta ABC\)          

\(\Delta AED \backsim \Delta ABC\)          

\(\Delta DEA \backsim \Delta ABC\)