Final answer:
The majority of the church floor plans are shaped like a c. cross, which is characteristic of cruciform architecture found in historical churches, illustrating both symbolic and practical purposes.
Step-by-step explanation:
The shape that makes up the majority of the floor plan of many churches is typically the cross. This is due to the cruciform architecture used in church design, which often features a long central nave intersected by a transept, creating a shape similar to a cross. This plan is evident in various historical church structures, such as Christian basilicas adapted from Roman public buildings, pilgrimage churches along the route to Santiago de Compostela, and Gothic cathedrals. The cruciform shape is not only symbolic of the Crucifixion but also served practical purposes, such as directing the attention towards the altar and controlling the flow of pilgrim traffic.