Question

in the graph, the triangle on the top is the pre-image.
which is the correct name for the image?
$\triangle$def
$\triangle$def
$\triangle$def
$\triangle$fed

Explanation:

In geometric transformations, the pre-image uses original labels (like $\triangle DEF$), while the resulting image is denoted by adding a prime symbol (') to each corresponding vertex label. The top triangle is given as the pre-image $\triangle DEF$, so its transformed image below must have vertices labeled $D'$, $E'$, $F'$.

Answer:

$\boldsymbol{\triangle D'E'F'}$