2a:T469,

Concave
Non-Convex

A shape or solid which has an indentation or "cave". Formally, a geometric figure is concave if there is at least one line segment connecting interior points which passes outside of the figure.

Three concave shapes: an arrow-like polygon with an inward notch, a figure with curved indentations, and a curved shape with a...

See also

Convex

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