Two cubes each of edge 12 cm are joined end to end. What is the surface area of the new cuboid formed?

Updated on May 13, 2025 | By Learnzy Academy

Given:
Edge of each cube = 12 cm
When two cubes are joined end to end, the new shape is a cuboid.

Step 1: Find the dimensions of the cuboid

Length = 12 cm + 12 cm = 24 cm
Breadth = 12 cm
Height = 12 cm

Step 2: Use the surface area formula for a cuboid

Surface Area = 2 × (length × breadth + breadth × height + height × length)
Surface Area = 2 × (24 × 12 + 12 × 12 + 12 × 24)
Surface Area = 2 × (288 + 144 + 288)
Surface Area = 2 × 720 = 1440 cm²

Hence surface area of the new cuboid  is 1440 cm²

Click here to download practice questions on Surface Areas and Volumes

More Questions on Surface Areas and Volumes

  1. The capacity of a cylindrical tank is 6160 cm³. Its base diameter is 28 m. What is the depth of this tank?
  2. A river 3 meters deep and 40 meters wide is flowing at the rate of 2 km per hour. How much water will fall into the sea in a minute?
  3. A cylindrical pillar has a diameter of 50 cm and a height of 3.5 m. What is the cost of painting its curved surface at the rate of Rs. 12.50 per m²?
  4. The diameter of a roller is 84 cm, and its length is 120 cm. It takes 500 complete revolutions to move once over and level a playground. What is the area of the playground in m²?
  5. A metal pipe is 77 cm long. The inner diameter of its cross-section is 4 cm and the outer diameter is 4.4 cm. What is its inner curved surface area?
  6. Two cubes each of edge 12 cm are joined end to end. What is the surface area of the new cuboid formed?
  7. The perimeter of floor of rectangular hall is 250m. The cost of the white washing its four walls is Rs. 15000. The height of the room is
  8. The length, breadth and height of a room is 5m, 4m and 3m. The cost of white washing its four walls at the rate of Rs. 7.50 per square meter is