Answer :

A center plan church is built around a central dome, which is the focal point of the church and represents the path to heaven. These churches are usually based on a floor plan reminiscent of a cross, with four arms of equal length intersecting under the dome.

Answer:

Central Dome

Explanation:

Most churches are constructed and planned to ressemble a giant cross and where the lines of the cross intersect they almost always put a dome above it, most catholic churches from old times are planned and build like that, with two altars in the sides of the cross dedicated to diverse saints and the main altar in the upper side of the cross, with a giant dome in the middle.