A Decagon
a pentagonpentagon.A pentagon is a figure with five sides.
A hexagon is a 2-dimensional figure with six sides. In general, a 2-dimensional figure with many sides is called a polygon.
A side of a solid figure is called a face.
A 2-dimensional figure with 12 sides is called a dodecagon. A 3-dimensional figure with 12 sides (faces) is called a dedecahedron.
Dekagon.
Decagon
Yes, and it is called the perimeter.
A heptagon is a polygon that has seven sides.
An hexagon
A dodecagon
a pentagon.