Heptagon - a seven sided two demensional figure
It is a sphere
I believe it is Rhombus
A hollow cylinder.
A cylinder as an example perhaps.
It is called a circle.A circle is an ellipse with zero eccentricity.Incidentally, you probably meant "geometric figure".
I think a circle
Quadrilateral is the name fr a geometric figure with 4 sides.
An octagon.
Heptagon - a seven sided two demensional figure
The Pentagon.
The correct name would be a "tetradecagon"
Each side is called a face.
The vertex of an angle
The eccentricity of the circle is zero.
A cube
Rhombus is the geometric name.