2019 · Q70
Six cubes, each with 12 cm edge are joined end to end. What is the surface area of the resulting cuboid?
Elementary MathematicsMensuration
- A3000 cm²
- B3600 cm²
- C3744 cm²
- D3777 cm²
Explanation
Six 12-cm cubes in a row form a cuboid 72 × 12 × 12. Its surface area is 2(72·12 + 12·12 + 72·12) = 2(864 + 144 + 864) = 2 × 1872 = 3744 cm². The answer is (C).