2023 · Q60
The length of a diagonal of a cuboid is 11 cm. The surface area is 240 square cm. What is the sum of its length, breadth and height?
Elementary MathematicsMensuration
- A16 cm
- B17 cm
- C18 cm
- D19 cm
Explanation
The diagonal gives l² + b² + h² = 121 and the surface area gives 2(lb + bh + hl) = 240. Adding: (l + b + h)² = 121 + 240 = 361. Hence l + b + h = 19 cm (D).