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What is a concave polygon?

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According to Math Open Reference, a concave polygon refers to a polygon or a plane figure that has one or more interior angles that measure greater than 180 degrees. This type of polygon is the opposite of the convex polygon.

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Math Open Reference indicates that a concave polygon looks like a vertex that is pushed in toward the inside of the figure. One of the characteristics of a concave polygon is that some of its diagonals lie outside the polygon's interior space. Moreover, the area of a concave polygon can be calculated by using the same method of computing for the area of any other irregular polygons.

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