In 2-d, the naming of polygons is such that a 10 sided shape is a decagon. Even if it is a 5-pointed star shape, it is a decagon. A concave decagon (rather than convex) but still a decagon.
In 3-d, a decahedron, possibly, with the term "sides" being used for "faces".
Chat with our AI personalities
A decagon is a shape that has ten sides. As long as the figure has ten sides to it, then it is a decagon.
Decagon
A decagon
decagon
draw a shape with ten sides