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JEE Mains · Maths · STD 11 - 10.1 circle and system of circle

यदि बिन्दु \(O (0,0)\) तथा \(P (1+\sqrt{5}, 2)\) पर वृत्त \(x^2+y^2-2 x-4 y=0\) की खीची गई स्पर्श रेखाये है, जो बिन्दु \(Q\) पर मिलती हो, तब त्रिभुज \(OPQ\) का क्षेत्रफल होगा -

  1. A \(\frac{3+\sqrt{5}}{2}\)
  2. B \(\frac{4+2 \sqrt{5}}{2}\)
  3. C \(\frac{5+3 \sqrt{5}}{2}\)
  4. D \(\frac{7+3 \sqrt{5}}{2}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\frac{5+3 \sqrt{5}}{2}\)

Step-by-step Solution

Detailed explanation

Tangent at \(O\) \(-( x +0)-2( y +0)=0\) \(\Rightarrow x +2 y =0\) Tangent at \(P\) \(x (1+\sqrt{5})+ y \cdot 2-( x +1+\sqrt{5})-2( y +2=0)\) Put \(x=-2 y\) \(-2 y(1+\sqrt{5})+2 y+2 y-1-\sqrt{5}-2 y-4=0\)…
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