A solid.
The cone IS a 3d figure.
It depends on the type of figure. If it is a 2D figure, then it is called area. If it is a 3D figure, then it is called volume.
It is an edge.
Volume if it's a 3D figure and area if it's a 2D figure
A three-dimensional figure with 30 faces is called a triacontahedron.
Sometimes because a sphere which is a 3d figure has a diameter
A 2D seven sided figure is called a heptagon. A 3D seven faced polygon is called a heptahedron.
noting but a 3D figure called a pyramaid
Polyhedra. AS long as the 3D shape has no curves
If its 2d its called a semi-circle, if its 3d its called a semi-sphere.
A circle is not a 3D figure because it only has two dimensions. A sphere is a 3D "circle".
A 3D figure shows length, width and depth. While a 2D figure only shows length and width.