The outer radius of a cyrindrical metal tube is R and t is the thickness of the metal. a.Show that the volume V,of metal in a length,l units,of the tube is given by V =πlt(2R-t). b. Hence calculate V when R =7.5, t=1 and l = 20.​

C=2pi(r)
Circumference of inner circle would be C= 2(3.14)(62.5) ---> 62.5 is the radius/half the diameter given.
C1=392.5 > for inner circle

For outer circle, C=2(3.14)(64) ---> radius of outer circle can be found by adding the 3 feet width of the path to the inner circle diameter because that is how much wider the outer circle is, then divide by 2 for the radius
C2=401.92 ---> for outer circle
Subtract C2-C1= 9.42 feet more