The invention of the allowed churches to become cathedrals. (2 words)

its a art history crossword puzzle so there isn't any answers but i need the term.

flying buttresses

Explanation:

The invention of flying buttresses was a crucial step in the development of medieval cathedral design. because they helped to make the soaring, thin stone arches and vast stained-glass windows possible by carrying the load of the building on the outside.

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a static shape has a fixed relationship between all of its vertexes. a dynamic shape can vary the position of at least one of its vertexes in relation to the others.