Final answer:
Ceilings that use the pointed arch instead of the rounded arch in Gothic architecture are called ribbed vaults. They allowed for greater height and more efficient weight distribution.
Step-by-step explanation:
In Gothic architecture, ceilings that use the pointed arch instead of the rounded arch are called ribbed vaults. The pointed arches allowed for greater height and the distribution of weight in a more efficient way. The ribbed vaults and pointed arches were distinguishing features of Gothic architecture, and they were borrowed from Islamic architecture.