Squares – area ratio to perimeter ratio: Given two squares whose areas are in the ratio 225 : 256, find the ratio of their perimeters.
Aptitude
Area
Difficulty: Easy
Choose an option
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A25:16
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B15:16
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C16:15
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D17:16
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ENone of these
Answer
Correct Answer: 15:16
Explanation
Introduction / Context:For similar figures like squares, side lengths scale with the square root of area scale. Perimeter is linear in side length.
Given Data / Assumptions:
- Area ratio A₁:A₂ = 225:256.
Concept / Approach:Side ratio = √(area ratio) = 15:16. Perimeter ratio equals side ratio.
Step-by-Step Solution:
√225 = 15; √256 = 16.Perimeter ratio = 15 : 16.Verification / Alternative check:Pick side lengths 15 and 16; perimeters are 60 and 64 ⇒ 15:16.
Why Other Options Are Wrong:25:16 confuses area with perimeter; 16:15 inverts; 17:16 is unrelated.
Common Pitfalls:Forgetting that perimeter is linear, not quadratic.
Final Answer:15:16.