Math is not a dance in the park

Mr. Slug has been working so hard on his math schoolwork that his poor brain feels somewhat mushy from the numbers that are floating around in his memory as he tries to sleep at night. Mrs. Slug has suggested he listen to some soothing music before bedtime, but this plan has backfired as he ends up even more tired from all of the activity both day and night. What is a poor slug to do?
GO DANCING! Yes, that is the only thing to do. Go dancing in circles. Very large circles. Circles so large that a slug needs to calculate the diameter of the circle, lest you get lost and cannot find your way back home to the center, and your dance partner, who is looking at you with two left optical tentacles as you spin around the dance floor wildly!
Have you ever wondered why slug trails are so circular and squiggly? It is because slugs know how to dance. (Cue the James Bond music, "You Only Circle Twice.") Now let's get to the meat of the matter:

Mr. Slug slid round and round. First he danced in very small circles. He made a silvery slug trail that was a mere 8 inches in circumference. He became disoriented from spinning around, so he stopped in his tracks to gain perspective. OK you slugs, here is your first puzzle: What is the diameter of the circle that Mr. Slug made?
Here is your first smarty slug clue:  Circumference = "pie"(22/7) x Diameter
                                      8 inches = 22/7 Diameter
                                      ? inches =    ?.....Diameter
                        (break it down one more time and you've got it!
                                                                     
Mr. Slug regained his composure and began to slide in very large circles.  Our math hero is now quite lost and cannot find his way home, where his dance partner Mrs. Slug is waiting patiently. Mrs. Slug is now looking at Mr. Slug with two left optical tentacles as he circles her, the diameter of the circle being 9 feet.  This is a very large circle, without your help, I doubt Mr. Slug will be able to get back to his wife, who is about to be asked to dance by a Mr. Goldtail. Please hurry with your calculation or Mrs. Slug may get covered with gold paint: What is the circumference of the circular slug trail Mr. Slug has drawn?

I am concerned that perhaps some of you slugs out there are needing a refresher course on the proper way to calculate this sort of problem, which involves the use of "pie" which can be approximated by 22/7 or 3 1/7. The circumference of a circle, then, is about 3 1/7 times the length of its diameter.

Here is a clue for you smarty slugs!  Again, it's:        

Circumference = "pie"(22/7) x Diameter 

I know this is not going to be an easy slime trail to follow for even the smartest of you smarty slugs. Rest assured that I am not having an easy time of it myself, which is why I am dragging you all down the primrose path with me, as a slug never slides alone.  If your brain hurts, you are making progress. Pat yourself on the mantle!

If any of you get these two slimy questions correctly answered, I will give you a vacation from math questions until the mid-terms! Yippee!!!!!

Of course, you are free to comment on this situation without solving the puzzle. Mr Slug has found other creative ways out of a pickle without the need for exact calculation, therefore, your assistance is greatly valued even if it does not involve number rasping.  Yippeee!!!! Let's dance!