Aspects

Concave

Anything related to concave geometric shapes

Convex

Anything related to convex geometric shapes

Others

Quality | Example |
---|---|

Simpler |
"The check for convex polygons your triangle is simpler than for concave ones see first linked article" from question "Detecting clicks in a non-rectangular shape" |

Hull far more difficult |
"But determining a concave hull is far more difficult than a convex hull" from question "Finding the area of a 2-D data set" |