Vault ,or curved ceiling
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The ceiling of conference hall are curved so that after the light reflection reaches all corners of the hall, the room becomes bright.
A cove ceiling is curved at the sides to meet the walls, instead of having a 90° angle (or other angle). A tray ceiling (note the correct spelling) has two or more stepped levels, resembling an inverted serving tray.
"Curved" refers to something that deviates from a straight line. It may refer to a bend in the road, a line on a graph, or the trajectory of a baseball.
a plane
A mirror that is curved outward is convex. A mirror that is curved inward is concave.