math
posted by awl .
What is the circumference and the area of a circle with a radius of 9.3mm.

I don't remember the equations exactly, but I know there are equations to find that. Just go an a search engine and type in "circumference equation" or "area equation" and you'll find it.

The circumference formula is:
c = pi times diameter
OR
c = 2piradius
Sorry, I don't know how to make a pi symbol on the keyboard. :)
I couldn't find the area formula... but just place 9.3 in where I said radius.
Hope I helped! :) 
Thanks Willow

area of circle = pi r^2