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JEE Mains · Maths · STD 11 - 9. straight line

मान लीजिए कि \(A B C\) एक त्रिभुज है जो रेखाओं \(7 x-6 y+3=0, x+2 y-31=0\) तथा \(9 x-2 y-19=0\) द्वारा बनता है। मान लीजिए कि बिंदु \((h, k)\) रेखा \(3 x+6 y-53=0\) में \(\Delta A B C\) के केंद्रक का प्रतिबिंब है। तो \(h^2+k^2+h k\) = __________

  1. A 47
  2. B 37
  3. C 36
  4. D 40
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Answer & Solution

Correct Answer

(B) 37

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Detailed explanation

\(\therefore \text { centroid of } \triangle \mathrm{ABC}\) \(=\left(\frac{9+3+5}{3}, \frac{11+4+13}{3}\right)\) \(=\left(\frac{17}{3}, \frac{28}{3}\right)\) Let image of centroid with respect to line mirror is \((\mathrm{h}, \mathrm{k})\)…
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