A regular decagon
A decagon based pyramid. It is a hendecahedron but that can take many shapes. A nonagon based prism, for example.
a decagon
Decagon
It is a decagon
A regular decagon
A ten-sided polygon is called a decagon. A decagon has ten internal angles of 144-degrees. All sides of a regular decagon are equal length.
concave decagon
Decagon. A decagon is the name of a ten sided shape.
The name is "ERROR". A decagon cannot have 11 sides.
Decagon.
The name of a regular polygon, with ten equal sides and ten equal angles, is a decagon, from the Greek word "deka", meaning ten.
It is a hexagon which is 6 sided polygon.
A decagon based pyramid. It is a hendecahedron but that can take many shapes. A nonagon based prism, for example.
decagon
Decagon
A decagon.