Polygons come in all kinds of shapes and sizes. In the video above, I cover the difference between a convex polygon and a concave polygon. One key difference is that a convex polygon has all interior angles less than 180° and no inward vertices, while a concave polygon has at least one angle greater than 180° and at least one vertex that points inward.
Because a convex polygon polygon has interior angles are less than 180°, any line segment drawn between two points will only touch the polygon in two places.
A concave polygon, on the other hand, has at least one interior angle greater than 180°, and at least one line segment drawn between two points will touch the polygon in at least three places. Essentially, it "caves in" at one or more points.
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