What feature is most famous and central to the design of the Hagia
Sophia? *

The most famous feature and central design of the Hagia Sophia is the

Dome

Explanation:

First of all, the Haga Sophia is a former Greek Orthodox Cathedral in Turkey built in 537 AD. It was inspired by Byzantine architecture and made by masonry architects. It was built with very contrasting geometrical features that would combine the best of mosques as well as cathedrals because the emperor wanted to please both sides of the population. Thus, the architects designed it with big domes with one principal in the center of the work. That is the main element of the structure.

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for the 2 countries u can do china and america because america has a democratic government while china has a communist government.

a democracy is a government run by the people either by directly voting or indirectly by electing representatives. an oligarchy is a government run by a few or a small group of people. a democracy and oligarchy are similar because both in an oligarchy and an indirect democracy, a small group of induvial determine the laws for a large group of people they are different because in an oligarchy it is easier to control and they do not have to answer to a large number of people in the country, unlike a democracy where they do have to answer to a large number of people an county that is a democracy would be the united states. a country that is an oligarchy would be the china.