The cross-shaped floor plan of a church is formed by the combined shapes of the nave and the transept.
A cross, is created when the nave and transept are combined. Any building that spans the main body of the structure is said to have a transept. Most often found in churches, transepts provide a cruciform layout by extending north and south from the main body.
They could have a central area the size of the church nave, two side aisles, or just one. The crossing where the transepts cross the nave is shared by the transept and the main nave axis.
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