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JEE Mains · Maths · STD 12 - 6. Application of derivatives

एक आयत, \(2 \sqrt{2}\) भुजा के एक समबाहु त्रिभुज के चित्रानुसार अंतर्गत है, तो ऐसे एक आयत के अधिकतम क्षेत्रफल का वर्ग है ........ |

  1. A \(1\)
  2. B \(2\)
  3. C \(3\)
  4. D \(4\)
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Answer & Solution

Correct Answer

(C) \(3\)

Step-by-step Solution

Detailed explanation

In \(\triangle \mathrm{DBF}\) \(\tan 60^{\circ}=\frac{2 \mathrm{~b}}{2 \sqrt{2}-\ell} \Rightarrow \mathrm{b}=\frac{\sqrt{3}(2 \sqrt{2}-\ell)}{2}\) \(\mathrm{~A}=\text { Area of rectangle }=\ell \times \mathrm{b}\) \(\mathrm{A}=\ell \times \frac{\sqrt{3}}{2}(2 \sqrt{2}-\ell)\)…
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