RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 21. Surface Area and Volume of a Sphere

Subject: Mathematics - Class 9th

Q. No. 16 of Exercise 21.2

Listen NCERT Audio Books to boost your productivity and retention power by 2X.

16

The diameter of a copper sphere is 18 cm. The sphere is melted and is drawn into a long wire of uniform circular cross-section. If the length of the wire is 108 m, find its diameter.

Volume of a sphere = (4/3)πr3


Volume of a cylinder = πr2h


Given, diameter of a copper sphere is 18 cm. The sphere is melted and is drawn into a long wire of uniform circular cross-section. The length of the wire is 108 m.


Long wire can be assumed to be a cylinder.



r = 0.6 cm


Chapter Exercises

More Exercise Questions