Q18 of 94 Page 228

If each side of a cube is doubled, its surface area

Let the side of the cube be “a” unit

Original Surface area = 6a² sq units

Now, when each side of a cube is doubled than its surface area:

New surface area = 6 (2a²) sq units

= 24a² sq units

Therefore, the surface area of the cube is 4 times than its original area

Hence, option B is correct

The diagonal of a cube is cm long. Its total surface area is

If each side of a cube is doubled then its volume

Three cubes of iron whose edges are 6 cm, 8 cm and 10 cm respectively are melted and formed into a single cube. The edge of the new cube formed is

Five equal cubes, each of edge 5 cm, are placed adjacent to each other. The volume of the cuboid so formed, is