Final answer:
A vertical translation is used to move triangle DEH onto triangle D′E′H′. The specific direction of the vertical translation is not provided.
Step-by-step explanation:
A vertical translation is used to move triangle DEH onto triangle D′E′H′. A vertical translation refers to a movement of an object up or down along the y-axis without changing its shape. In this case, triangle DEH is moved onto triangle D′E′H′ by shifting it vertically either upward or downward.
To describe the vertical translation used, we need to know whether it was vertically upward or vertically downward in the coordinate system. Without further information, we can't determine the exact direction of the vertical translation.