Question

(a) The outer and inner radius of a hollow
cylinder are 6.75 cm and 5.25 cm and
the height is 13 cm. By melting the cylinder
a solid cylinder of height 6.5 cm is formed
Find the radius of the solid cylinder.
[W.B.M. 1996)​

Answer 1

Answer:

6 cm

Step-by-step explanation:

volume of outer cylinder- Vol of inner hollow part

3.14(6.75)²(13)-3.14(5.25)²(13)

1860-1125

=735

now then,

let radius of the cylinder be x

Vol of cylinder = πr²h

3.14(x²)(6.5)=735

x²=735/20.48

X=√36 approx.

X=6