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JEE Mains · Maths · STD 11 - 10.2 parabola,ellipse,hyperbola

પરવલય \(y^2 = 4x\) એ બિંદુ \((1, 2)\) અને અક્ષને સ્પર્શતા બે વર્તુળોમાં નાના વર્તુળનું ક્ષેત્રફળ ચો.એકમમાં મેળવો  

  1. A \(4\pi \left( {2 - \sqrt 2 } \right)\)
  2. B \(8\pi \left( {3 - 2\sqrt 2 } \right)\)
  3. C \(4\pi \left( {3 + \sqrt 2 } \right)\)
  4. D \(8\pi \left( {2 - \sqrt 2 } \right)\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(8\pi \left( {3 - 2\sqrt 2 } \right)\)

Step-by-step Solution

Detailed explanation

Equation of tangent to the parabola \({y^2} = 4x\,\,at\) \(\left( {1,2} \right)\,\,\) is \(2y = 4\left( {\frac{{x + 1}}{2}} \right)\) \( \Rightarrow y = x + 1\) Equation of normal \(y = - x + 3\) Let center be \(C\left( {3 - r,r} \right)\) Now \(P{C^2} = {r^2}\)…
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