एक समबाहु त्रिभुज की भुजा 9 सेमी है। इस समबाहु त्रिभुज के परिगत वृत्त की त्रिज्या क्या है?

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SSC CGL 2022 Tier-I Official Paper (Held On : 13 Dec 2022 Shift 3)
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  1. 2\(\sqrt{3}\) सेमी
  2. 5 \(\sqrt{3}\) सेमी
  3. 4 \(\sqrt{3}\) सेमी
  4. 3\(\sqrt{3}\) सेमी

Answer (Detailed Solution Below)

Option 4 : 3\(\sqrt{3}\) सेमी
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Detailed Solution

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दिया गया है:

समबाहु त्रिभुज की भुजा = 9 सेमी

प्रयुक्त अवधारणा:

परिवृत्त त्रिज्या (R) = (a × b × c)/4 × क्षेत्रफल

गणना:

परिवृत्त त्रिज्या (R) = (a × b × c)/4 × समबाहु त्रिभुज का क्षेत्रफल

⇒ (9 × 9 × 9)/{4 × (√3/4) × 9 × 9}

⇒ 9/√3 = 3√3 सेमी

∴ सही उत्तर 3√3 सेमी है।

Alternate Methodप्रयुक्त अवधारणा:

समबाहु त्रिभुज की परिवृत्त त्रिज्या = भुजा/√3

गणना:

परिवृत्त त्रिज्या (R) = भुजा/√3

⇒ 9/√3 = 3√3 सेमी

∴ सही उत्तर 3√3 सेमी है।

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