एक समबाहु त्रिभुज की ऊंचाई 9√3 सेमी है। इस समबाहु त्रिभुज का क्षेत्रफल क्या है?

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SSC CGL 2022 Tier-I Official Paper (Held On : 07 Dec 2022 Shift 1)
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  1. 92√3 सेमी2
  2. 67√3 सेमी2
  3. 49√3 सेमी2
  4. 81√3 सेमी2

Answer (Detailed Solution Below)

Option 4 : 81√3 सेमी2
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दिया गया:

समबाहु त्रिभुज की ऊँचाई = 9√3

प्रयुक्त सूत्र:

ऊँचाई = a√3 / 2

क्षेत्रफल = a2√3 / 4

गणना:

सूत्र के अनुसार,

⇒ ऊँचाई = a√3 / 2

⇒ 9√3 = a√3 / 2

= 18 सेमी

अब त्रिभुज का क्षेत्रफल,

⇒ क्षेत्रफल = a2 √3 / 4

⇒ क्षेत्र = \(\frac{18 \times 18 \times \sqrt3}{4}\)

⇒ क्षेत्रफल = 81√3 सेमी2

⇒ अतः, समबाहु त्रिभुज का क्षेत्रफल 81√3 सेमीहै।

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