a circle
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".
The geometric shape with the minimum eccentricity is a circle. Eccentricity is a measure of how much a conic section deviates from being circular; for a circle, this value is 0, indicating no deviation. In contrast, other shapes, like ellipses or hyperbolas, have higher eccentricities. Thus, among all conic sections, the circle represents the shape with the least eccentricity.
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 correct name would be a "tetradecagon"
The Pentagon.
Each side is called a face.
The eccentricity of the circle is zero.
The vertex of an angle
A cube