Cone or a pyramid
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A square based pyramid.
A line is the only 1-dimensional figure, but only while it's a straight line. As soon as it turns or bends, it's then 2-dimensional.
A hexagon is a 2-dimensional figure and so has only 1 facet.
It is a sphere which looks like a globe
There is no such thing as a 3-dimensional triangle. A triangle is a 2-dimensional figure. So, depending on what you mean exactly, the volume can vary. In the case of a pyramid - whether it has a triangular base, a rectangular base, or any other base - the volume is (1/3) Bh, that is, 1/3 times the area of the base times the perpendicular height.