It is impossible to have a 180 degree angle because all three of a triangle's angles have to equal 180. If you have one angle of 180, then you would have 2 angles of 0, making a plain old straight line.
I guess it is a dice or what else is it supposed to be? A hexagon is a plane figure with 6 sides.
Oh, dude, it's like this - a plane figure is flat like a pancake, just two dimensions, while a solid figure is like a 3D movie, it's got depth and volume. So, if you're into flat stuff, go for plane figures, but if you like things with a little extra oomph, solid figures are where it's at.
real and upright image
An angle is formed by at least three points of reference. The origin and two others in plain geometry. A line may be drawn from the point of origin and any other given point. Any other line may be drawn from the origin and any other point. The difference between these lines is referred to as an angle.
rectangles squares
A plain figure is a simple figure.
It is impossible to have a 180 degree angle because all three of a triangle's angles have to equal 180. If you have one angle of 180, then you would have 2 angles of 0, making a plain old straight line.
Any convex three dimensional figure with straight edges (or plain faces) will have polygons for bases so there is an infinity of such shapes.
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.
An octagon.
Nullarbor Plain
an octagon.
Octahedron
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
A square is a flat plain figure whose four sides are of equal length.A rectangle is a flat plain figure whose lengths are longer that the widths.So a rectangle is not like a square!