- A
- B
- C
- D
Step-by-Step Solution
Floor and ceiling are both . Together: . Trap : counting only one of the two. Trap : that is the LSA — the four walls, which is not what was asked. Trap : doubling a second time.
Answer: C)
A godown is a cuboid 15 m long, 12 m wide and 6 m high. Find the combined area of its floor and its ceiling.
Class 8MensurationMensuration
Key idea: Surface area of a cuboid
A cuboid has 3 pairs of identical opposite faces. Their total area:
- 2 faces of (top + bottom)
- 2 faces of (front + back)
- 2 faces of (left + right)
**TSA of cuboid = .**
**LSA of cuboid = ** — only the four side walls, used for room painting (not floor/ceiling).
Special case (cube, ): TSA = , LSA = .
- 2 faces of (top + bottom)
- 2 faces of (front + back)
- 2 faces of (left + right)
**TSA of cuboid = .**
**LSA of cuboid = ** — only the four side walls, used for room painting (not floor/ceiling).
Special case (cube, ): TSA = , LSA = .
Master this chapter in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Mensuration practice questions
More Class 8 Mensuration practice
A pillar is a cuboid with a square base of side 40 cm and a height of 250 cm. Find the…A cubical box encloses a volume of 512 cm³. Find its total surface area.The curved surface area of a cylindrical pillar is 264 m² and its radius is 3 m. Find…A closed cylindrical drum has a diameter of 28 cm and a height of 10 cm. Find the total…A cylindrical water tank that is open at the top has radius 7 m and height 4 m. Its…