Final answer:
Roman architects used engaged columns for structural support and visual appeal in their buildings, such as the Temple of Portunus in Rome.
Step-by-step explanation:
Roman architects used engaged columns as a structural and decorative element in their buildings. Engaged columns are columns that are attached to the wall they support, rather than being freestanding. They were commonly used in Roman architecture to provide support and create visually appealing facades.
An example of the use of engaged columns in Roman architecture can be seen in the Temple of Portunus in Rome. This temple features an Ionic colonnade with engaged columns on each side and across the back, creating an impressive entrance.