Given that diameter of solid cylinder =2cm
Given that solid cylinder is recast to hollow cylinder
Length of hollow cylinder =16cm
External diameter = 20cm
Thickness = 2.5mm= 0.25cm
Radius of cylinder =1cm
So volume of solid cylinder=π(1)2 h ........(1)
Let length of solid cylinder be h
Thickness = R - r
0.25 = 10 - r
Internal radius = 9.75cm
So volume of hollow cylinder =π16(100 -95.0625) ......(2)
Volume of solid cylinder is equal to volume of hollow cylinder.
(1) = (2)
Equating equations (1) and (2)