bent or curved inwards
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It means sunken in. If the top of a stone is concave, it can hold rainwater.'Convex' means swollen out. If the top of a stone is convex, water rolls off.
Concave, because you can connect the corners from the outside.
concave
A concave line is a line that caves in.
No, you would need at least 4 points to create a concave polygon.