How did Renaissance architects learn
Greco-Roman building techniques?

The Renaissance was a very important era for architecture because during the Renaissance, architecture became so much more than just building. The Renaissance was created because the middle ages was such a dark, depressing time. ... The changes in architecture were due to humanism, new trends/styles of buildings, and art.

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They studied Greek and Roman ruins to figure out how classical buildings were constructed.

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well this is going to be a long answer lol ok so the visigoths were a branch of the goths who frequently raided rome, uh the hunas attacked the guptas a lot and weakened them, uuhm of course the romans used math and science in there every day lives i mean they had a whole empire to run, and rome was split into east and west by a general named diocletian. hope this you! : )