Answer: 4.) 9.4 inches, 5.) 12.6 inches
Explanation:
4.) So basically one revolution is going around a circle which will be finding the circumference. The equation to finding the circumference is (2)x(pi)x(radius) so if the diameter is 3 inches then half of that is 1.5 inches which is the radius. Multiply 1.5 times pi and 2 which is 9.4 inches.
5.) Same thing multiply the radius which is 2 times 2 and pi. The answer is 12.6.