### Constructive Geometry of the Ground Plan
of the North Barn at Thorley Hall (St Barnabas Centre)

These notes are on three pages - page 1, this page, and page 3
7. From point O draw 4 construction lines that meet the circle intersections C, D. E and F. These points, together with A and B are the corner angles of an inner touching hexagon.
C, D, E & F outline a rectangle of proportion 1 : square root of 3, commonly used in barn
geometry

8. Extend OC, OD, OE and OF to meet the bay intervals at points C, D, E, and F, . These are corner angle points of a hexagon touching the outside of the circle. They define a rectangle similar to the one in 7. above but slightly larger.

9. Draw a line through C, D, F and E and continue for the barn length. The intersections at C, D, F, and E, provide the positions of the arcade posts and bays which themselves define the nave and two side aisles.

These notes are on three pages - page 1, this page, and page 3