# RD Sharma Solutions Class 8 Mathematics Solutions for Surface Area and Volume of Right Circular Cylinder Exercise 22.2 in Chapter 22 - Surface Area and Volume of Right Circular Cylinder

Question 28 Surface Area and Volume of Right Circular Cylinder Exercise 22.2

2.2 cubic dm of brass is to be drawn into cylindrical wire 0.25 cm in diameter.
Find the length of the wire.

As per the question, brass is drawn into cylindrical wire, so we have to consider the volume of the cylinder as per its geometrical shape.

We have,

Diameter of

cylindrical wire = 0.25 cm

Radius of wire = d/2 = 0.25/2 = 0.125cm

Let length

of wire be ‘h’ cm

Volume of brass wire = 2.2 dm3 = 2200 cm3

πr2h = 2200

22/7 × 0.125 × 0.125 × h = 2200

h = 2200×7 / 22×0.125×0.125

= 15400 / 0.34375

= 44800 cm

= 448m

∴ Length of

the wire is 448m.

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