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A shape with nine sides is called a Nonagon. A shape that has ten sides is called a Decagon, and one with eleven sides is called a Hendecagon. ...
A 24 sided shape is called an icosikaitera. A shape qualifies for this name if all its 24 sides are of the same length and all internal angles are the same size ...
The decagon is the ten-sided shape you would be referring to. If it had only nine sides, it would have been called a nonagon, and with eleven sides, it would ...