a Dodecahedron is a 3 diamentional shape having 12 plain faces in a regular solid figure with 12 equal pentagonal sides!
An octagon.
The solid you are describing is called a cylinder. It has two circular faces, one curved face, and no vertices.
A plain figure is a simple figure.
Any convex three dimensional figure with straight edges (or plain faces) will have polygons for bases so there is an infinity of such shapes.
there never was a cat with 2 faces, if you believed that, you are plain stupid!
a square is a plain figure which has all the sides equal but a rhombus is a plain figure which has the opposite sides equal.
With a figure 8 bridle you can use mostly any kind of english riding bit. I like to use full cheek snaffles , or dee-ring bits. Or just plain snaffles in general.
an octagon.
dull and or plain
There is no such concept in maths. A plane figure is a mathematical concept but that is not what the question is about.
the grate hungarean plain. took me a wile to figure out myself