Question

identifying a transformation
what type of transformation maps △qrs to △qrs?
dilation
translation
rotation
reflection

Explanation:

Step1: Recall transformation definitions

Dilation changes size, translation moves shape without rotation or reflection, rotation turns shape around a point, reflection flips shape over a line.

Step2: Analyze the triangles

The orientation of $\triangle QRS$ and $\triangle Q'R'S'$ is different. The shape has been turned around a point. It is not a dilation (size没变), not a translation (orientation changed), and not a reflection (no mirror - like flip).

Answer:

rotation