Definition of

Concave

Concave

Curved inwards.

Example: A polygon (which has straight sides) is concave when there are "dents" or indentations in it (where the internal angle is greater than 180°)

Think "con-cave" (it has a cave in it!)


Try adjusting the points below to make the shape concave:

../geometry/images/area-coords.js?mode=concave
See: Convex