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A rectangular mango orchard is 85 m long and 45 m wide. Fencing costs ₹32 per metre. What does it cost to fence the orchard once round?

Class 6MensurationMensuration
  • A₹4160
  • B₹16,640
  • C₹122,400
  • D₹8320

Step-by-Step Solution

Fencing follows the boundary, so use the perimeter: m. Cost = = ₹8320. ₹4160 comes from using only 85 + 45 = 130 m and forgetting to double it. ₹122,400 uses the AREA — but fencing is sold by the metre, not by the square metre.
Answer: D) ₹8320

Key idea: Perimeter shortcuts for special shapes

**Rectangle**: opposite sides are equal, so perimeter = l + b + l + b = 2(l + b).

**Square**: all four sides equal, so perimeter = 4 × s.

**Equilateral triangle**: all three sides equal, perimeter = 3 × s.

**Regular polygon with n sides of length s**: perimeter = n × s.

These shortcuts are just 'add the sides' written shorter.

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