Question

What kind of shape is this?

Convex nonagon

Concave octagon

Concave nonagon

Concave decagon

Answer 1

the answer is a concave decagon

Answer 2

I believe this is a "Concave Decagon."

Explanation:

A Decagon consists of 10 sides. This abstract shape has 10 sides, so this shape is a Decagon.

Hope this helps! :)