Question

why are the ceilings of concerts hall aremade curved?

Answer 1

They are made curved so that the sound after reflecting form the ceiling reaches every corner of the concert hall and the audience listens the sound clearly.

Answer 2

$\sf \huge \underline{answer} \implies$

The ceiling of concert halls is curved because people seated at the back rows of the hall may not clearly hear the speaker’s sound.

When the ceiling is curved or concave, it reflects sound waves making it travel farther distances.

Some facts about sound waves.