Question

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Answer 1

In my opinion, I would say that it was a concave, because if you look up the word concave it is, "having an outline or surface that curves inward like the interior of a circle or sphere."

I hope this helps, and if you need any additional help as to what a concave is, please refer to the link.

Cited sources

https://www.google.com/search?client=opera&q=what+is+a+concave&sourceid=opera&ie=UTF-8&oe=UTF-8