4 corners and 6 edges
it has 4
Six.
4
First, I'm assuming the by corners, you mean verticies. Second, the answer depends on what you mean by "three dimensional triangle. To some, this could be interpreted as a pyramid. However, I think it is more likely that you are referring to a triangular prism- a prism shape with a triangle as each base. In this case, there are six "corners". Each side has three, where the length-wise edges of the prism intersect the verticies of the triangle. There are three corners on each side, for a total of six. If you really meant a pyramid, then there are five corners.
A triangular prism.
An octagonal prism has 16 vertices (or corners).An octagonal prism has 16 vertices (or corners).An octagonal prism has 16 vertices (or corners).An octagonal prism has 16 vertices (or corners).
A rectangular prism is a cuboid which has 8 vertices (corners), while a triangular prism has six verticesA triangular prism is like a cylinder but with triangles instead of circlesA rectangular prism is the same
A triangular prism has six vertices (corners).
A rectangular prism (or cuboid) has 8 corners.
A hexagonal prism has 12 corners or vertices
There are 6 vertices (corners) in a triangular prism.
A rectangular prism has 8 vertices/corners.