Polygon that lies entirely in a half-plane defined by any of its edges.

A straight line drawn through a convex polygon will cross at most two sides.

- Any polygon with at least one interior angle that is re-entrantis a non-convex polygon. This type of polygon is sometimes called a concave polygon.
- All interior angles of a convex polygon are salient angles.

### Examples

- This is a convex polygon:

- This is a non-convex polygon: