areas, circumferences and volume

Question

A Susan B Anthony Dollar has a radius of 0.52 inches and a thickness of 0.0079 inches. Round the answers to the nearest ten thousandth:

a) circumference of the coin

b) area of one face of the coin

c)volume of the coin

Answer 1

Diane, I'm sure you were given formulas for these quantities. Here they are again (π is the Greek letter pi):

C (circle)     = 2 π r

A (circle)     = π r²

V (cylinder) = At = π r² t

Just plug in your values and round appropriately.

Answer 2

I posted an answer, and I bet others have, as well, but mine keeps disappearing and reappearing. O.O 

When I go to My Questions and Answers, this problem shows up, but not always does my answer. 

How would I report this problem?