Question

The difference between outside and inside curved surface area of the cylindrical magically pipe 14 cm long is 352cm square. If the pipe is made of 3520 cm of matel.find the outer and inner radius of the pipe

Answer 1

2pai×Rh-2pai×rh=352cm^2
2pai(R-r)h=352
2×22/7(R-r)×14=352
R-r=352/4×22
R-r=8......1
R+r=3520/4×22
R+r=80.....2
2and 1 we get
R+r-R+r=80-8
2r=72
r=72/2
r=36
R-r=8
R-36=8
R=44