4 significant figures.
3 of them.
2 of them.
2 of them.
There are infinitely many spatial figures and it is not possible to give a comprehensive answer. For a partial answer, see the following link. However, the link is concerned only with polyhedra. There are other spatial figures - like spheres and ellipsoid etc.
4 significant figures.
10 significant figures.
Hundreds and hundreds are the same thing. If you are looking for this number in figures, this would be equal to 3,000 - more commonly pronounced three thousand.
3 of them.
Six.
3
4
Hundreds if not thousands.
2 of them.
2 of them.
2 of them.
6 of them.