Answer: The answer is rotation
Step-by-step explanation:
Translation is when we slide a figure in any direction.
The triangles are on top of eachother which its not a translation.
Reflection is when we flip a figure over a line.
The triangle is not flipped over any line, it's on top of the lines.
Rotation is when we rotate a figure a certain degree around a point.
All of the points have shifted over, thus making a roation.
Dilation is when we enlarge or reduce a figure.
Both triangles are the same size so this is not the answer