It is a point.
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Well the fourth dimention is time. From here, we expand on the theory that a object, viewed in the 2nd dimention, is extended when viewed in the 3rd dimention. That is because we can only see the height and the the width. We cannot make out the length. When we view it from the 3rd; we can see all three lengths. Time is like the 2nd dimention. It is a single time-line. However, when we view it from the fifth dimention, we can see all other possible time lines. Such is similar.
A pentagon is a polygon that has 5 sides. It is a planar geometric shape made of 5 line segments, and by definition, the shape lies in a plane. It has only two dimensions. In the two dimensions of the plane, the pentagon has five sides. By adding a third dimention to view it, it still has only five sides because it has no "thickness" owing to the fact that it is a geometric figure confined to a plane. In either a two domentional view or a three dimentional view, the pentagon has 5 sides. Adding another dimention to view it will not "add any more sides" to the pentagon.
This is a true statement. Points do not have dimensions like a length or a width. A point only has a location in space.
Geometric dilation (size change, typically expansion) does not change the shape of a figure, or its center location, only the size.
A sphere