Question

For a $\Delta ABC,$ $AB=4$ mm, $BC=5$ mm and $AC=6$ mm. If $\Delta ABC\cong \Delta DEF$, then $EF=$___.

• A. $4$ mm
• B. $6$ mm
• C. $5$ mm
• D. cannot be determined

Answer 1

Answer: (C)

$5$ mm

In $\Delta ABC,$ $AB=4$ mm, $BC=5$ mm and $AC=6$ mm
Also, $\Delta ABC\cong \Delta DEF,$

So, corresponding sides are equal in length.
$BC=EF$
$\therefore EF=5$ mm