If triangles ABC and DEF shown below are congruent then length of side DF is.

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Solution

The correct option is C 5

$C o n c e p t : - --------- -$
Corresponding parts (sides & angles) of congruent triangles are equal

Now,
$∵ △ A B C ≅ △ D E F$
$∴ A B = D E = 3$
[Corresponding sides are equal]
Similarly,
$B C = E F = 4$
$A C = D F = 5$
Hence, $D F = 5$

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