what kind of transformation is this?

Answer:
Reflection
Step-by-step explanation:
It is a reflection because it is like they are looking in the mirror.
[tex]\huge\boxed{Hello!:)}[/tex]
This transformation is called [tex]\huge\bold{Reflection.}[/tex]
Reflection simply means an object has been reflected.
Here, the triangle has been reflected.
[tex]\huge\boxed{Thus, \: the\: answer\: is: \: Reflection.}[/tex]
[tex]\huge\mathfrak{Good \:luck!}[/tex]
[tex]\boxed{UnknownGirl\: here\: to\:help}[/tex]