RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 21. Mensuration-II (Volumes and Surface Areas of a Cuboid and a Cube)

Subject: Maths - Class 8th

Q. No. 13 of Exercise 21.4

Listen NCERT Audio Books - Kitabein Ab Bolengi


Three cubes whose edges measure 3 cm, 4 cm, and 5 cm respectively are melted to form a new cube. Find the surface area of the new cube formed.


Edge of three cubes are respectively = 3cm , 4 cm , 5 cm


Sum of volume of these cubes =

After melted these cubes a new cube is formed.

Let edge length of this new cube = a cm




Edge of new cube = 6 cm

Surface area of new cube =

Chapter Exercises

More Exercise Questions