Q16 of 94 Page 228

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

We know that,

Diagonal of the cube = a

= 9

i.e. a = 9

Therefore,

Total surface area of the cube = 6a²

= 6 × 9 × 9

= 486 cm²

Hence, option B is correct

The area of the cardboard needed to make a box of size 25 cm x 15 cm x 8 cm will be

The diagonal of a cube measures cm. Its volume is

If each side of a cube is doubled then its volume

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