Question 1044591
Hi there,,
Considering cylinder of 8" height.
It will have a circumference of 5"
To find radius:
Circumference = 2πradius 
2πradius = 5"
πradius = 2.5"
Radius = 2.5"/π

Volume = πr^2h
Volume = π(2.5/π)^2 x 8
Volume = 15.91 ins^3
........................
Considering cylinder of 5" height.
It will have a circumference of 8"
To find radius:
Circumference = 2πradius 
2πradius = 8"
πradius = 4"
Radius = 4"/π

Volume = πr^2h
Volume = π(4/π)^2 x 5
Volume = 25.46 ins^3
.................
Ratio of volume of 8" tall cylinder
to volume of 5" tall cylinder
15.91 ins^3 to 25.46 ins^3
1 : 1.6.
Hope this helps :-)