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

જો બિંદુ \((-4,5)\) નું રેખા \(x+2 y=2\) પરનું પ્રતિબિંબ એ વર્તુળ \((x+4)^2+(y-3)^2=r^2\) પર આવેલ હોય, તો \(r=\) ............

  1. A \(1\)
  2. B \(2\)
  3. C \(75\)
  4. D \(3\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(2\)

Step-by-step Solution

Detailed explanation

Image of point \((-4,5)\) \(\frac{\mathrm{x}-\mathrm{x}_1}{\mathrm{a}}=\frac{\mathrm{y}-\mathrm{y}_1}{\mathrm{~b}}=-2\left(\frac{\mathrm{ax_{1 } + \mathrm { by } _ { 1 } + \mathrm { c }}}{\mathrm{a}^2+\mathrm{b}^2}\right)\) Line : \(x+2 y-2=0\)…
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