Cone
It is a face.
The only thing I can think of is a cone.
It has a flat base, a curved surface area, a circular edge and one vertex.
Each flat surface is a face
Cone
A a solid figure on a flat surface is a plane figure (I do believe)
This is an impossibility. If it is a solid figure then it will have more than 1 surface. If it has only 1surface and it is a solid, then it must be a sphere, but the surface of a sphere is not flat is it? By using the word 'solid' then by definition, it is three dimensional and has thickness. A cylinder has no vertices , but it has 2flat surfaces. A vertex is a point where three lines meet, such as on a pyramid, which has 4 vertices. Have I forgotten something or is this a 'trick' question?
5
The flat surface of a solid figure is called a face. For example, a rectangular prism has 6 flat surfaces and therefore 6 faces.
the flat surfaces of a solid figure are the
One of the figure which has no flat surface is Sphere.
cone
a square a rectange a triangle a hexagon an octogon a polygon
a cone has one flat surface one vertex and no edge.
It is a face.
A face is the flat surface on a solid figure. For example, a triangular prism has five flat surfaces and therefore five faces.