There are seven methods of displaying rectangular and square shapes.
2 Pt Rectangle  This option creates a rectangle from two points which should represent one of its sides. The width of the rectangle is provided in the Width dimension, normally W. If the width value is positive, the rectangle will be created to the right of the two points.
2 Pt Rect Cent  This option creates a rectangle from two points at either end of one of its axes of symmetry. The width of the rectangle is provided in the Width dimension, normally W. The sign of the width dimension makes no difference to the rectangle construction.
3 Pt Rectangle  This option creates a rectangle from three points. The first two points represent one of its sides. The width of the rectangle is calculated as the perpendicular offset of the third point from the line joining the first and second points.
3 Pt Rect Cnt  This option creates a rectangle from three points. The second and third points represent one of its sides. The width of the rectangle is calculated as twice the perpendicular offset of the first point from the line joining the second and third points
2 Pt Ortho Rect  This option creates a rectangle from two points which represent a diagonal. The rectangle is always orthogonal in the current coordinate system so the sides will be generated eastwest and northsouth. This type of shape is used in building elevation surveys to represent doors and windows
2 Pt Square  This option creates a square from two points which represent one of the sides of the square. The square will be created the right of the two points.
2 Pt Diag Square  This option creates a square from two points which represent one of the diagonals of the square
2 Pt Rectangle 
2 Pt Rect Cent 
3 Pt Rectangle 
3 Pt Rect Cent 


2 Pt Ortho Rect 
2 Pt Square 
2 Pt Diag Square 

The Open Rectangle check button applies to the 2 Pt Rectangle and 3 Pt Rectangle options. If ticked, the side of the rectangle that is opposite the side created by the first two points will not be displayed. An example of where this may be used is where a rectangular conservatory has been added to the side of a house.
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