The horizontal distance across the round canopy, from one edge to the opposite edge.
The distance along a rib line, over the crown to the opposite edge. The hanging valance is excluded. Calculated from this model's canopy curve.
Open size is width × length. Both sides are equal in this preview. The diagonal is shown separately and is not the side length.
Canopy dimensions exclude protruding rib tips. Overall height and pole thickness stay fixed when you resize the canopy.