A convex shape is a shape that is pushing out like a house -> /\ <-
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Food shaped like a polygon
Assuming that the shape is like the cross section of a convex lens, the perimeter is 16.17 units.
i dont think any1 knows * * * * * A concave polygon has at least one reflex angle. Equivalently, in a convex polygon, a line joining ANY two points in (or on) the polygon lie wholly within (or on) the polygon. In a concave polygon there are at least two points for which the line joining them does not lie wholly inside (or on) the polygon.
An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. An octahedron can have 6 to 12 vertices.
It is convex if you look at it from the inside but it is not any kind of polygon.