Mark out a central square of 50 feet.
Divide the central square into 2 parts.
Find the diagonal of the half square.
Rotate it-
and project it out to create a second square.
The relationship of inner and outer squares is in the order of the Golden Section. This gives the central extended crossing space.
Rotate the great square at 45 degrees-
and project it to the west.
The diagonal gives the length of the nave.
The space of each transept arm equals on half of the great central square.
Rotate the great central square-
project to the east.
The diagonal gives the width, and the half diagonal gives the lenght of the choir.
The hemicycle is formed inside a great circle having a center point c2.5m east of the rectangular body of the choir.

Dynamic Geometry