- A11
- B9
- C10
- D20
Step-by-Step Solution
The wire length is the perimeter, so 4 × side = 40, giving side = 40 ÷ 4 = 10 cm.
Answer: C) 10
A wire of length 40 cm is bent to form a square. Find the side of the square.
Class 6MensurationMensuration
Key idea: Choosing the right concept
Watch for the question wording:
- **Fencing a garden, putting a border, walking around a track** → perimeter (length unit)
- **Painting a wall, covering a floor with tiles, area of cloth needed** → area (square unit)
A classic trap: 'How much wire to fence a square plot of side 20 m?' — perimeter, not area. The wire goes *around* the boundary.
- **Fencing a garden, putting a border, walking around a track** → perimeter (length unit)
- **Painting a wall, covering a floor with tiles, area of cloth needed** → area (square unit)
A classic trap: 'How much wire to fence a square plot of side 20 m?' — perimeter, not area. The wire goes *around* the boundary.
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