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JEE Mains · Maths · STD 12 - 10. vector algebra

माना \(A (2,3,5), B (-1,3,2)\) तथा \(C(\lambda, 5, \mu)\) एक त्रिभुज \(A B C\) के शीर्ष हैं। यदि \(A\) से होकर जाने वाली माध्यिका, निर्देशांक अक्षों पर समान कोण बनाती है, तो

  1. A \(5\lambda - 8\mu \, = 0\)
  2. B \(8\lambda - 5\mu \, = 0\)
  3. C \(10\lambda - 7\mu \, = 0\)
  4. D \(7\lambda - 10\mu \, = 0\)
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Answer & Solution

Correct Answer

(C) \(10\lambda - 7\mu \, = 0\)

Step-by-step Solution

Detailed explanation

If \(D\) be the mid-point of \(B C,\) then \(D=\left(\frac{\lambda-1}{2}, 4, \frac{\mu+2}{2}\right)\) Direction ratios of \(AD\) are \(\frac{\lambda-5}{2}, 1, \frac{\mu-8}{2}\) Since median \(AD\) is equally inclined with coordinate axes, therefore direction ratios of \(AD\)…
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