Definition:Concave Polygon

This page is about concave polygon. For other uses, see concave.

Definition

Let $P$ be a polygon.

$P$ is a concave polygon if and only if:

at least one internal angle of $P$ is greater than $180 \degrees$.

Also see

• Definition:Convex Polygon

• Results about concave polygons can be found here.

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): concave polygon
• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): polygon
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): concave polygon
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): polygon
• 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): concave polygon