What is the maximum area of a rectangle with perimeter meters?
Answer and explanation
Correct answer: A. square meters
- Step 1: Let dimensions be and . Perimeter . Area . Differentiate: . Thus (a square), and . **Answer: square meters. Why not the others:** " square meters" corresponds to a non-optimal rectangle of sides and ; " square meters" confuses the perimeter value with the resulting area calculation; " square meters" corresponds to a narrow rectangle of sides and .
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