Multiple choice

Three cubes of sides 7 cm each are kept adjacent to each other. What is the total surface area of the cuboid formed?

  1. 484 cm2

  2. 441 cm2

  3. 343 cm2

  4. 686 cm2

  5. None of these

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Because 3 cubes are adjacently joined, length of cube = 7 + 7 + 7 = 21 cm, breadth = 7 cm and height = 7 cm. 

Total surface area = 2(lb + bh + hl) = 2(21 x 7 + 7 x 7 + 7 x 21) 

= 686 cm2