Can someone please kind enough to explain this questions for me. Thank you

What are some examples of other important polyhedra?

What characteristics help you determine whether a polyhedron is regular or irregular?

How can you check for symmetry and rotational symmetry of polyhedra?

2 answers

You will find good reading in the following article which also answers most of your questions.
http://en.wikipedia.org/wiki/Polyhedron
Thank you MathMate!!! I did some research but I just did not find what I was looking for.