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. 12 of Exercise 21.4

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


Two cubes, each of volume 512 cm3 are joined end to end. Find the surface area of the resulting cuboid.


Volume of each cube = 512 cm3

Let length of edge of each cube = a cm



= a

When these two cubes are joined end to end a cuboid is formed :

Length of cuboid = 8+8 = 16 cm

Breadth = 8 cm

Height = 8 cm

Surface area of resulting cuboid =


Chapter Exercises

More Exercise Questions