Practice30Create account

Which needs MORE wrapping paper to cover completely — a cube of edge 10 cm, or a cuboid measuring 12 cm × 10 cm × 8 cm?

Class 8MensurationMensuration
  • AThe cuboid, by
  • BBoth need exactly the same amount
  • CThe cube, by
  • DThe cuboid, by

Step-by-Step Solution

Wrapping paper is decided by SURFACE AREA. Cube: . Cuboid: . The cube needs more, even though the cuboid is longer. Trap "the cuboid": judging by looks, or by volume vs — which also favours the cube). Trap : using for the breadth-height face instead of .
Answer: C) The cube, by

Key idea: Choosing the right formula — pick by what's asked

- 'Total cloth needed to cover a closed box' → TSA of cuboid.
- 'Paint to cover only the side walls of a room' → LSA of cuboid (4 walls).
- 'How much water fills a tank' → volume.
- 'Label paper around a tin' → CSA of cylinder (only the curved part).
- 'Steel sheet to make a closed pipe' → TSA (CSA + 2 circles).

Before plugging numbers, ask: which surface(s) actually matter for this problem?

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 room is 8 m long, 6 m wide and 3.5 m high. Its four walls and its ceiling are to be…A solid block of wax measuring 18 cm × 12 cm × 8 cm is melted and recast as a single…A garden roller has a diameter of 84 cm and a length of 120 cm. How much ground does it…A surveyor sketched field ABCDE using the base line AD = 100 m. The dashed orange…Box P is a cuboid and box Q is a cube, with the sizes shown. Both are closed boxes made…