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

माना वृत्त \(x ^2+ y ^2-4 x +3=0\) के दो बिंदुओं \(A\) तथा \(B\) पर स्पर्श रेखाएँ \(O (0,0)\) पर मिलती हैं। तब त्रिभुज \(OAB\) का क्षेत्रफल है

  1. A \(\frac{3 \sqrt{3}}{2}\)
  2. B \(\frac{3 \sqrt{3}}{4}\)
  3. C \(\frac{3}{2 \sqrt{3}}\)
  4. D \(\frac{3}{4 \sqrt{3}}\)
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Answer & Solution

Correct Answer

(B) \(\frac{3 \sqrt{3}}{4}\)

Step-by-step Solution

Detailed explanation

\(C:(x-2)^{2}+y^{2}=1\) Equation of chord \(AB : 2 x =3\) \(OA = OB =\sqrt{3}\) \(AM =\frac{\sqrt{3}}{2}\) \(\text { Area of triangle } OAB =\frac{1}{2}(2 AM )( OM )\) \(=\frac{3 \sqrt{3}}{4} sq . \text { units }\)
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