Question

the triangles are congruent by sss or hl. which transformation(s) can map △pqr onto △stu? translation only rotation only rotation, then reflection reflection, then translation

Explanation:

Translation moves a figure without changing its orientation. Rotation turns a figure around a point. Reflection flips a figure over a line. Observing the orientation of $\triangle PQR$ and $\triangle STU$, we can see that $\triangle PQR$ first needs to be reflected over a line to match the orientation of $\triangle STU$ and then translated to map exactly onto it.

Answer:

D. reflection, then translation