Question

what are the rounded structures called​

Answer 1

Answer:

If this structure extends to ground level, the round building may be called a "rotunda". Drums are also called "tholobates" and may or may not contain windows. A "tambour" or "lantern" is the equivalent structure over a dome's oculus, supporting a cupola.

Explanation:

@MNF

Answer 2

Answer:

spherical or circle

Explanation:

both are rounded