You can name them in any way you like. The four sides of a quadrilateral could be called John, Paul, George and Ringo if you like (and are old enough to know better). However, single characters are usually preferred: with lower case letters for the sides and upper case letters for vertices. You can use letters from any language, but Roman and Greek characters are preferred because they are more widely available in font sets. Numbers are not such a good idea because these are used for measures of length or angles.
Twelve. The number of sides and vertices in a polygon are always the same.
triangular pyramid
A polygon with three vertices and three sides is a triangle. A polygon with four vertices and four sides is a quadrilateral.
It will have 12 sides
A polygon has the same amount of vertices as it does sides, so it would have 7 vertices.
A polygon is a closed figure bounded by sides only. Triangle is the polygon of 3 sides and 3 vertices.
Twelve. The number of sides and vertices in a polygon are always the same.
triangular pyramid
Fourteen. Each polygons has the same number of sides as it has vertices. Therefore, a polygon with 14 vertices must have 14 sides.
A polygon with 5 sides/vertices is called a pentagon.
12 sides, 12 angles, 12 vertices
A polygon with three vertices and three sides is a triangle. A polygon with four vertices and four sides is a quadrilateral.
19. sides=vertices
It will have 12 sides
A polygon has the same amount of vertices as it does sides, so it would have 7 vertices.
No, because the vertices are the corners where the sides meet in a polygon
It has 20 vertices.