Cone or a pyramid
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.
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.
It is a sphere which looks like a globe
A hexagon is a 2-dimensional figure and so has only 1 facet.
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.
You're probably thinking of a cone. There is some disagreement as to whether the point of a cone qualifies as a vertex.
No, it is 1 dimensional.
An ellipsoid or a toroid or other 3-dimensional objects with more than one "holes". Or simply a ... sphere.
hasarafazoid
Cylinder
A paraboloid is one possible answer.
Any irregular polygon with 4 or more sides can have only one pair of parallel sides. For example, a child's drawing of the silhouette of a house (the base, two walls and a triangular roof) is a pentagon and the two walls are the 1 pair of parallel sides.