Final answer:
The Italian Renaissance style of architecture in the 15th century was characterized by an emphasis on symmetry, proportion, geometry, and regularity of parts.
Step-by-step explanation:
The Italian Renaissance style of architecture in the 15th century was characterized by an emphasis on symmetry, proportion, geometry, and regularity of parts. Renaissance architects used classical elements such as columns, pilasters, lintels, arches, and domes in their designs. They aimed to revive the golden age of classical antiquity and moved away from the complex and irregular profiles of Gothic structures.