Answer
$\overline{DF}$=8
$\overline{EF}$=11
$\overline{DE}$=10
Work Step by Step
It is clearly mentioned in the question that the triangles are congruent.
which indicates that
$\overline{AC}$=$\overline{DF}$
$\overline{AB}$=$\overline{EF}$
$\overline{BC}$=$\overline{DE}$
and measures of
$\overline{AC}$=8
$\overline{AB}$=11
$\overline{BC}$=10
therefore
$\overline{DF}$=8
$\overline{EF}$=11
$\overline{DE}$=10
