Question

explain a line graph, bar,graph,circle,and a pictograph

Answer 1

I searched Google under the key words "line graph" to get this:

http://www.google.com/search?client=safari&rls=en&q=line+graph&ie=UTF-8&oe=UTF-8

Search Google for the remaining concepts.

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.