Area of a circular plot from fencing length: A wire of length 88 m fences a circular plot (wire equals the circumference). Find the area of the plot.
-
A526 m2
-
B556 m2
-
C616 m2
-
DNone of these
-
E600 m2
Answer
Correct Answer: 616 m2
Explanation
Introduction / Context:Given the circumference, we can compute the radius and then the area. This is a direct application of circle formulae with careful substitution.
Given Data / Assumptions:
- Circumference C = 88 m
- r = C / (2π)
- Area A = πr^2
Concept / Approach:Compute r first, preferably using π = 22/7 for clean arithmetic, then compute A exactly.
Step-by-Step Solution:r = 88 / (2π) = 44 / π = 44 / (22/7) = 14 mA = π * 14^2 = π * 196 = 616 m2 (with π = 22/7)
Verification / Alternative check:Using π ≈ 3.1416 gives A ≈ 615.75 m2, which rounds to 616 m2, matching the option.
Why Other Options Are Wrong:526 and 556 m2 are off from the exact computation; “None” is false since 616 m2 is correct; 600 m2 is a rounded guess, not exact.
Common Pitfalls:Forgetting to divide by 2π; squaring 44/π incorrectly; mixing units.
Final Answer:616 m2