A 3D triangle, typically a tetrahedron, has 4 vertices and 6 edges. It is a solid shape composed of equilateral triangles, differing from a 2D triangle which has 3 vertices and edges.
The question refers to a shape known as a 3D triangle, which in geometry is typically a tetrahedron.
A tetrahedron has 4 vertices and 6 edges.
It is composed of 4 equilateral triangles, each of which contributes to the overall structure. Every face (triangle) meets at a vertex, and every edge is where two faces meet.
Thus, while a 2D triangle has 3 vertices, 3 edges and angles adding up to 180 degrees, a tetrahedron, being a 3D version, has more vertices and edges due to its extra dimension.
Considering other 3D shapes: An icosahedron, for example, differs significantly from a tetrahedron, as it has 20 faces, with each face being an equilateral triangle, and meets at 12 corners or vertices.
The knowledge about triangles and their properties is fundamental in understanding the basic geometric shapes, which then extrapolate to more complex structures utilized in various fields, including mathematics and chemistry.