Vertex facts for kids
B is an ear because the line between C and D is completely inside the shape. C is a mouth because the line between A and B is completely outside the shape.
A vertex is a corner. More than one vertex are called vertices. A vertex is a point where two or more lines, curves, rays, or sides meet, and is often represented by letters such as 
, 
, 
and 
.
For example, the vertex of an angle is the point where the two edges of the angle intersect, and a vertex of a cube is simply one of its corners—of which there are 8.
The concept of vertex applies to both two-dimensional and three-dimensional geometrical objects. For example, a tetrahedron has 4 vertices, and a pentagon has 5 vertices.
Related pages
See also
In Spanish: Vértice para niños
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Vertex Facts for Kids. Kiddle Encyclopedia.