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

જો વર્તુળ \(x^{2}+y^{2}=r^{2}(r>0)\) રેખા \(y-2 x=3\) ની સાપેક્ષે તેની જીવાની લંબાઇ \(r\) હોય તો \(r^{2}\) ની કિમત શોધો 

  1. A \(\frac{9}{5}\)
  2. B \(\frac{12}{5}\)
  3. C \(12\)
  4. D \(\frac{24}{5}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(\frac{12}{5}\)

Step-by-step Solution

Detailed explanation

Let chord \(A B=r\) \(\because \Delta AOM\) is right angled triangle \(\therefore OM =\frac{ r \sqrt{3}}{2}=\) perpendicular distance of line \(AB\) from (0,0) \(\frac{r \sqrt{3}}{2}=\left|\frac{3}{\sqrt{5}}\right|\) \(r^{2}=\frac{12}{5}\)
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