I think a circle
An octagon.
A cube
In the common use of the phrase "geometric solid", the answer is three. In advanced mathematics, dimensions greater than three are also studied. In many cases, the name of a plane (two-dimensional) figure has the ending "-gon" as in "hexagon", while the name of a solid figure (three dimensional) has the ending "-hedron" as in tetrahedron.
Its the name for a shape
The name of an eleven sided geometric shape is a Hendecagon or endecagon.
a circle
Quadrilateral is the name fr a geometric figure with 4 sides.
It is called a circle.A circle is an ellipse with zero eccentricity.Incidentally, you probably meant "geometric figure".
An octagon.
Heptagon - a seven sided two demensional figure
The correct name would be a "tetradecagon"
The Pentagon.
Each side is called a face.
The vertex of an angle
A cube
The geometric name for the shape of a Hula Hoop or a smoke ring (which are hollow) is a torus. If the shape is solid, like a donut or a ring, it's called a toroid.
Rhombus is the geometric name.