ΔABC ~ ΔPQR, ΔABC और ΔPQR के क्षेत्रफल क्रमशः 64 सेमी2 और 81 सेमी2 हैं और AD और PT क्रमशः ΔABC और ΔPQR की माध्यिकाएं हैं। यदि PT = 10.8 सेमी, तो AD = ?

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SSC CGL 2020 Tier-I Official Paper 1 (Held On : 13 Aug 2021 Shift 1)
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  1. 9 सेमी
  2. 12 सेमी
  3. 8.4 सेमी
  4. 9.6 सेमी

Answer (Detailed Solution Below)

Option 4 : 9.6 सेमी
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दिया गया है:

ΔABC ~ ΔPQR

ΔABC का क्षेत्रफल = 64 सेमी2

ΔPQR का क्षेत्रफल = 81 सेमी2

PT = 10.8 सेमी 

AD, ΔABC की माध्यिका है।

PT, ΔPQR की माध्यिका है।

अवधारणा: 

दो समरूप त्रिभुजों के क्षेत्रफलों का अनुपात संगत भुजाओं और माध्यिकाओं के वर्गों के अनुपात के बराबर होता है।

 = 

गणना:

 = 

⇒  =  

​  =  = 

​  = 

​ AD =  = 9.6 सेमी

∴ AD = 9.6 सेमी 

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