A cube
It is an octagon
A pentagon
A triangle.
It is an 8 sided octagon
A pyramid with a square base.
Hexagon
A pentagon
A triangle.
It is an octagon
It is a 6 sided hexagon
It is an 8 sided octagon
It is the 6 sided hexagon
All of the polygons except the triangle
A pyramid with a square base.
Assuming that a space figure means a 3-dimensional object, the answer is a square based pyramid.
If it is a 2-dimensional figure then it is a quadrilateral. If it is a 3-dimensional figure then it is a tetrahedron.
A square:) :) :)