Wire reshaped: A circular wire is bent to form a rhombus with side 11 cm (perimeter conserved). Find the diameter of the original circular wire.

Aptitude Area Difficulty: Easy
Choose an option
  • A
    28 cm
  • B
    3.5 cm
  • C
    7 cm
  • D
    14 cm
  • E
    22 cm

Answer

Correct Answer: 14 cm

Explanation

Introduction / Context:When a wire is reshaped, length (perimeter) remains constant. We convert between a circle’s circumference and a rhombus’ perimeter.

Given Data / Assumptions:

  • Rhombus side = 11 cm → Perimeter = 4 * 11 = 44 cm
  • Same length becomes circle circumference
  • Use π = 22/7 unless stated

Concept / Approach:Circumference C = π * d. With C known (44 cm), solve for diameter d.

Step-by-Step Solution:

C = 44 cmd = C / π = 44 / (22/7) = 44 * 7 / 22 = 14 cm

Verification / Alternative check:Radius r = 7 cm. Circumference 2πr = 2 * 22/7 * 7 = 44 cm, matches the wire length.

Why Other Options Are Wrong:28 cm is twice the correct diameter; 7 cm is the radius; 3.5 cm is quarter of the diameter; 22 cm is unrelated here.

Common Pitfalls:Using 2πr formula but substituting d for r or forgetting perimeter equality during shape change.

Final Answer:14 cm

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