What is the shape of st peters basilica?

St. Peter's Basilica is primarily designed in a cruciform shape, resembling a cross, which is a common design in Renaissance and Baroque churches. Its central dome, designed by Michelangelo, is a prominent feature and adds to the structure's grandeur. The basilica's façade is characterized by a large portico with columns and a grand entrance, enhancing its monumental presence in Vatican City. Overall, the combination of its dome and cross layout creates a harmonious and majestic architectural form.