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If verticle is meant to be vertical, then none.
No. A circle has no corners and a square has four corners. There is no object that has no corners and four corners.
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 heptagon has 7 corners and a octagon has 8 corners .
Corners.