Assuming that a space figure means a 3-dimensional object, the answer is a square based pyramid.
a cube, or hexahedron.
rectangle
cylinder
It is a cylinder.
The point at which there establishes one to one correspondence between two entities is ideally the 'congruent point'. ex: Two line segments are congruent if they have the same length, two angles are congruent if they have the same measure, two polygons are congruent if all the corresponding sides and angles are equal.
The shape with the fewest sides is a triangle, which has three sides. Triangles are the simplest polygon and are defined by three vertices connected by straight edges. Any shape with fewer than three sides cannot enclose a space, as it would not form a closed figure.
Sounds like a Cube
Cylinder
A triangular prism seems to fit the given description
A shape with three vertices besides a triangle is a "trilateral" or "polygon with three sides." However, if you're looking for a specific type, an example is a "trapezoid," which has four sides but can have three vertices if one of the sides is collapsed, creating a degenerate form. Another example is a "digon," which exists in spherical geometry and has two sides and three vertices when considering the space it occupies.
A simple polygon is a closed, straight-sided figure in which the sides do not overlap.
An impossible figure in two dimensional space. A Dacagon has ten sides and must have ten angles.