Are constructed by placing barrel vaults at right angles to cover a square space known as a

I believe the correct answer to this is:

groin vaults are constructed by placing barrel vaults at right angles to cover a sqaure space known as a bay.

Hope this helps :)

based on the images pictured above, the major difference between the two cathedrals: the cathedral of notre dame and the amiens cathedral, is that the cathedral of notre dame emphasizes the horizontal lines while the amiens cathedral emphasizes the vertical lines.